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Fatal error: Uncaught Error: Call to undefined function SimpleJWT\Util\ASN1\gmp_import() in /opt/include/vendor/kelvinmo/simplejwt/src/SimpleJWT/Util/ASN1/Value.php:148 Stack trace: #0 /opt/include/vendor/kelvinmo/simplejwt/src/SimpleJWT/Keys/RSAKey.php(167): SimpleJWT\Util\ASN1\Value::integer() #1 /opt/include/vendor/kelvinmo/simplejwt/src/SimpleJWT/Crypt/Signature/OpenSSLSig.php(106): SimpleJWT\Keys\RSAKey->toPEM() #2 /opt/include/vendor/kelvinmo/simplejwt/src/SimpleJWT/JWT.php(217): SimpleJWT\Crypt\Signature\OpenSSLSig->sign() #3 /opt/poc/poc-oidc-jar/index.php(151): SimpleJWT\JWT->encode() #4 {main} thrown in /opt/include/vendor/kelvinmo/simplejwt/src/SimpleJWT/Util/ASN1/Value.php on line 148