[{reqId}] {exception_url}   Lcobucci\JWT\Signer\InvalidKeyProvided: Key cannot be empty

from /srv/mediawiki/php-1.40.0-wmf.27/vendor/lcobucci/jwt/src/Signer/InvalidKeyProvided.php(34)
#0 /srv/mediawiki/php-1.40.0-wmf.27/vendor/lcobucci/jwt/src/Signer/Key/InMemory.php(25): Lcobucci\JWT\Signer\InvalidKeyProvided::cannotBeEmpty()
#1 /srv/mediawiki/php-1.40.0-wmf.27/vendor/lcobucci/jwt/src/Signer/Key/InMemory.php(45): Lcobucci\JWT\Signer\Key\InMemory->__construct(string, string)
#2 /srv/mediawiki/php-1.40.0-wmf.27/vendor/league/oauth2-server/src/Entities/Traits/AccessTokenTrait.php(51): Lcobucci\JWT\Signer\Key\InMemory::plainText(string)
#3 /srv/mediawiki/php-1.40.0-wmf.27/vendor/league/oauth2-server/src/Entities/Traits/AccessTokenTrait.php(62): MediaWiki\Extension\OAuth\Entity\AccessTokenEntity->initJwtConfiguration()
#4 /srv/mediawiki/php-1.40.0-wmf.27/vendor/league/oauth2-server/src/Entities/Traits/AccessTokenTrait.php(91): MediaWiki\Extension\OAuth\Entity\AccessTokenEntity->convertToJWT()
#5 /srv/mediawiki/php-1.40.0-wmf.27/extensions/OAuth/src/Rest/Handler/AbstractClientHandler.php(54): MediaWiki\Extension\OAuth\Entity\AccessTokenEntity->__toString()
#6 /srv/mediawiki/php-1.40.0-wmf.27/includes/Rest/Router.php(515): MediaWiki\Extension\OAuth\Rest\Handler\AbstractClientHandler->execute()
#7 /srv/mediawiki/php-1.40.0-wmf.27/includes/Rest/Router.php(421): MediaWiki\Rest\Router->executeHandler(MediaWiki\Extension\OAuth\Rest\Handler\RequestClient)
#8 /srv/mediawiki/php-1.40.0-wmf.27/includes/Rest/EntryPoint.php(195): MediaWiki\Rest\Router->execute(MediaWiki\Rest\RequestFromGlobals)
#9 /srv/mediawiki/php-1.40.0-wmf.27/includes/Rest/EntryPoint.php(135): MediaWiki\Rest\EntryPoint->execute()
#10 /srv/mediawiki/php-1.40.0-wmf.27/rest.php(31): MediaWiki\Rest\EntryPoint::main()
#11 /srv/mediawiki/w/rest.php(3): require(string)
#12 {main}