when encountered this Error:

UncaughtPromiseError > SyntaxError
Uncaught Promise > Unexpected token '�', "�PNG

SyntaxError: Unexpected token '�', "�PNG

"... is not valid JSON
    at JSON.parse ()
    at _parseJson (http://localhost:8069/web/static/lib/stacktracejs/stacktrace.js:2508:27) (node_modules/stacktrace-gps/stacktrace-gps.js:59)
    at http://localhost:8069/web/static/lib/stacktracejs/stacktrace.js:2692:53 (node_modules/stacktrace-gps/stacktrace-gps.js:243)

could you please help me handling this?