Internal Error. {I can not connect to mysql}

[BulldogCTISolutions]

I can see my City in the database, but localhost:8888 is not displaying any cities: Select the System just displays "No city was found" (not even the default one.

If I go to the table tb_city, I see both the default and my city. When I enter the url localhost:8888/api/cities into PostMan I get the above title.

In the browser console I get:
OST http://localhost:8888/api/cities 500 (Internal Server Error)
send @ mootools-yui-compressed.js:491
i.extend.$owner @ mootools-yui-compressed.js:127
listCities @ interface.js:225
i.extend.$owner @ mootools-yui-compressed.js:127
initialize @ interface.js:169
i.extend.$owner @ mootools-yui-compressed.js:127
(anonymous) @ mootools-yui-compressed.js:122
(anonymous) @ main.js:88
(anonymous) @ mootools-yui-compressed.js:375
(anonymous) @ mootools-yui-compressed.js:17
each @ mootools-yui-compressed.js:24
fireEvent @ mootools-yui-compressed.js:374
g @ mootools-yui-compressed.js:520

[vaibhawj]

I am also facing the same issue. Any suggestions?