Because the response you are getting it not properly formatted for Json conversion.

JSONObject obj = new JSONObject(response);

Its returning boolean which you are trying to convert into JSONObject.

Edit 1: It might also occur that there is problem while fetching boolean.

Try to fetch it like this:

jsonObject.optBoolean("error");

Resource Reference

• http://stackoverflow.com/questions/36368512/how-to-debug-json-parsing-error-value-true-at-error-of-type-java-lang-boolean