Error -32000 - can not withdraw btc

Hey, I was mintng STAMPs, I recieved this error. Minted couple, but can not withdraw some 0.002 btc remaining there. Can you help?

Error making request to UNKNOWN/Default: JSON-RPC Error:

Type: Server error

Code: -32000

Message: Bad status code returned: ‘500’. result body: '{“result”:null,“error”:{“code”:-26,“message”:“non-mandatory-script-verify-flag (Signature must be zero for failed CHECK(MULTI)SIG operation)”},“id”:0} '.

guess nobody knows lol fun times