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Uncaught (in promise) SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data
_check_version https://v8-3.foldingathome.org/assets/i ... 21.js:3643
AsyncFunctionThrow self-hosted:804
(Async: async)
ND https://v8-3.foldingathome.org/assets/i ... 21.js:3643
KD https://v8-3.foldingathome.org/assets/i ... 21.js:3643
<anoniem> https://v8-3.foldingathome.org/assets/i ... 21.js:3643

API error: TypeError: NetworkError when attempting to fetch resource.

how can I get 8.3.18 working?

Please try https://v8-4.foldingathome.org/
It is backwards compatible.

Looks like a network or corrupted install issue.If the error persists, check if Folding@Home servers are online.Sometimes API issues come from temporary server downtime.