500 Unexpected token 'e', "error code: 1016" is not valid JSON

SyntaxError: Unexpected token 'e', "error code: 1016" is not valid JSON
    at async functionsWorker-0.2994898703501063.js:12228:17
    at async Promise.all (index 0)
    at async yc (functionsWorker-0.2994898703501063.js:2386:14)
    at async bi (functionsWorker-0.2994898703501063.js:2382:267)
    at async Ze4 (functionsWorker-0.2994898703501063.js:12495:3)
    at async functionsWorker-0.2994898703501063.js:13100:18