Where to find the exact location and fix this error?

Firstly, I am not a programmer, I bought some code from somewhere and the support team were so poor than I expected.

I got this error on opening one specific page from my app. And the data do not show.

My App:

NetworkCallFailure: com.google.gson.jsonSyntaxExeption: java.lang.illegalStateExeption : Expected a string but was BEGIN OBJECT at line 1 column 1642 path $[0].meta_data[4].value