No preview result

[andelrey]

Describe the bug

I add a description of my app and i cant see any preview result, because of an error in status,i dont know how to fix it

Link to the Bolt URL that caused the error

https://bolt.new/~/sb1-tyuamvba

Validations

• Please make your project public or accessible by URL. This will allow anyone trying to help you to easily reproduce the issue and provide assistance.

Steps to reproduce

Initial NLST Platform Setup

i need a web app for pc/mac users and also for mobile users. There are description and specification:

Description part:
There is a description of my web-app
It will be a simulator for the data analyst.
Suggested name :nlst
The application implies registration of users, without registration it will be inaccessible
The first version of the application will contain only a section on sql. Basic functionality of the application:
1.Interview part:
1.1Main sql questions that are asked on analyst.This will contain common questions that companies usually ask(divided into levels)
1.2Feedback from the user
The user can upload his/her interview results: position to be interviewed for (taking into account the level: junior,middle,senior),company list of questions and tasks, which should be initially with hidden answers and should be open/close by button,general impression of the interview.
2. theoretical part
2.1 Basic theoretical extracts with examples
2.2 Cards for each topic: for each topic there will be a list of questions, with 3-4 answer options (sometimes you can choose more than one).
3.3 List of tasks on different topics with a place where the description of a certain task is given, a place where to enter the code. The application should have the functionality that in advance it is possible to enter tests to check the solution, to check by sending tasks via sql to the server. After the correct solution should open the rating and with discussions of solutions.Until the moment when the system marks the solution correct, access to comments, which should be moderated on the sending of the solution.(we will call these tasks with sandbox further).
In the menu there should be a choice, go to the list of feedback on interviews with tasks, leave a feedback itself.
In the feedback form there should be a section for attaching tasks.
Feedback should be moderated before publication
Also each feedback should have comments and usefulness (rating based on likes/dislikes).
Every registered user should be able to add to favorites:
-general theory questions
-question cards
-tasks with sandboxes further
-interview itself
-tasks from the interview
The user should be able to select all favorites at once, as well as by category separately.

Specification part

NLST - SQL Learning & Interview Preparation Platform ## Project Overview

NLST is an interactive platform designed to help data analysts master SQL through structured learning, practice, and interview preparation. The platform combines theoretical knowledge, practical exercises, and real interview experiences with modern learning approaches.

Core Features ### 1. Authentication & User Management

Secure registration and login system
OAuth integration (Google, GitHub)
Role-based access (Student, Expert, Moderator, Admin)
User profile with learning statistics and achievements
Custom learning path selection

2. Learning Experience #### 2.1 Structured Learning Paths

Beginner to Advanced progression tracks
Prerequisites system for topics
Progress tracking with visual indicators
Customizable learning speed
Achievement system with badges and certificates

2.2 Theory Section

Interactive SQL concepts explanation
Visual query execution flow
Schema visualization tools
Real-world examples for each concept
Downloadable reference materials
Search functionality with filtering
Multimedia content support (videos, diagrams)

2.3 Practice Environment

Interactive SQL editor with syntax highlighting
Real-time query validation
Multiple database type support (PostgreSQL, MySQL, SQLite)
Query performance analysis
Schema visualization
Query execution plan explanation
Save and share solutions
Code quality feedback

3. Interview Preparation #### 3.1 Question Bank

Categorized by difficulty (Junior, Middle, Senior)
Company-specific question collections
Question tags and search functionality
Interactive flashcards with spaced repetition
Mock interview simulator
Time-tracked practice sessions

3.2 Interview Experience Sharing

Structured interview feedback form
Company-wise interview insights
Task difficulty ratings
Solution discussions
Anonymous posting option
Moderation system for quality control

4. Community Features #### 4.1 Collaborative Learning

Discussion forums for each topic
Expert Q&A section
Study groups creation
Real-time collaborative problem solving
Peer code review system
Mentorship program

4.2 Content Interaction

Bookmark and favorite system
Personal notes attachment
Custom collections creation
Content sharing capabilities
Progress sharing
Learning streaks and challenges

Technical Architecture ### Frontend

Next.js with TypeScript
Tailwind CSS for styling
Progressive Web App capabilities
Responsive design for all devices
Offline mode for theory content
Real-time collaboration features
Dark/light mode support

Backend

Node.js with Express
GraphQL API
WebSocket support for real-time features
Microservices architecture:
Authentication Service
Learning Service
Practice Service
Community Service
Analytics Service

Database Layer

PostgreSQL for primary data
Redis for caching and real-time features
ElasticSearch for advanced search
MongoDB for user-generated content

Infrastructure

Docker containerization
Kubernetes orchestration
CDN integration
Automated backup system
Monitoring and logging system

Security Features

JWT authentication
Rate limiting
SQL injection prevention
Input sanitization
GDPR compliance
Regular security audits
Data encryption at rest

Analytics & Monitoring

User progress tracking
Learning pattern analysis
Performance metrics
Error tracking
Usage statistics
A/B testing capability
Custom analytics dashboard

Content Management

Version control for content
Moderation workflow
Content update system
Quality assurance process
SEO optimization
Content recommendation engine

Mobile Experience

Responsive design
Native-like experience
Offline content access
Push notifications
Touch-optimized SQL editor
Mobile-friendly navigation

Development Phases ### Phase 1: Core Features

Basic authentication
Theory content structure
Simple SQL editor
Basic question bank
User profiles

Phase 2: Enhanced Learning

Interactive exercises
Progress tracking
Achievement system
Advanced SQL editor
Interview simulator

Phase 3: Community & Collaboration

Discussion forums
Study groups
Real-time collaboration
Expert Q&A
Mentorship system

Phase 4: Advanced Features

AI-powered recommendations
Advanced analytics
Performance optimization
Mobile app development
API for third-party integration

Success Metrics

User engagement rates
Learning progress metrics
User satisfaction scores
Community participation
Interview success rates
Platform performance metrics

Maintenance & Support

Regular content updates
Performance monitoring
User support system
Bug tracking and resolution
Feature request handling
Regular security updates
I'll help you create this SQL learning platform using Next.js with TypeScript for a robust full-stack application. Let's start with the initial setup and core authentication features.

Initial NLST Platform Setup

package.json
src/app/layout.tsx
src/app/page.tsx
src/app/globals.css
tailwind.config.ts
src/lib/supabase/schema.sql
npm run dev
I've set up the initial project structure with:

Next.js 14 with TypeScript and Tailwind CSS
Supabase integration for authentication and database
Basic schema design for core features
Landing page with authentication links
Next steps:

Implement authentication pages (sign-in/sign-up)
Create protected routes and layouts
Develop the learning dashboard
Add SQL editor component
Implement the interview preparation section
Would you like me to continue with any specific part?

so,i dont see any preview, is it okay?

Let me help you get the preview working. We need to add some essential configuration files that were removed.

Restore Essential Configuration Files

next.config.js
postcss.config.js
src/lib/utils.ts
package.json
npm run dev
I've restored the essential configuration files and added missing dependencies. The dev server should now start properly. You should see a preview with:

A dark gradient background
"Welcome to NLST" heading
Two buttons for "Sign In" and "Sign Up"
Let me know if you still don't see the preview, and I'll help troubleshoot further.

Rollback to Checkpoint
i still dont see any preview

Let me help you get the preview working. I notice that several key files were removed. Let's restore the essential files and structure.

Restore Essential Files

src/app/page.tsx
src/app/layout.tsx
src/app/globals.css
tailwind.config.ts
npm run dev
I've restored the minimal set of files needed to get the landing page working. You should now see a preview with:

A dark gradient background
"Welcome to NLST" heading
Two buttons for "Sign In" and "Sign Up"
If you still don't see the preview, please let me know and I'll help troubleshoot further. It might take a few moments for the dev server to start and for the preview to load.

Rollback to Checkpoint
I'm importing your StackBlitz project into Bolt. This may take a moment as I set everything up. Once it's ready, you'll be able to explore and interact with your code.

Importing StackBlitz Project

sb1-tyuamvba
npm install
npm run dev
I've successfully imported your project. I'm ready to assist you with analyzing and improving your code.

it shows as no preview available?

Let me help you get the preview working. First, let's check if the development server is running properly.

Restart Development Server

npm run dev
If you're still seeing "no preview available", there might be a few potential issues:

The development server might need a moment to fully start up
There might be a compilation error preventing the app from building
Could you please let me know if you see any error messages in the terminal output? This will help me better diagnose and fix the issue.

Also, to ensure all dependencies are properly installed, we can try stopping the server (if it's running) and running a fresh install:

Reinstall Dependencies

npm install
npx next dev
After this completes, please let me know if you're still not seeing the preview and share any error messages you might see in the terminal.

Expected behavior

I installed the main features ,there werent any of result, so, i rollbacked to the first step,there was nothing

Screen Recording / Screenshot

No response

Platform

Browser name = Chrome
Full version = 131.0.0.0
Major version = 131
navigator.appName = Netscape
navigator.userAgent = Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36
performance.memory = {
  "totalJSHeapSize": 49120962,
  "usedJSHeapSize": 45132778,
  "jsHeapSizeLimit": 4294705152
}
Username = andelrey
Chat ID = 6c5101210861
Client version = b03c990
Server version = b03c990

Additional context

No response