Error when generating schema in MergeSchemas.php line 217

[olup]

Impossible to get the stitching done. Error is as follow :

PHP Fatal error:  Uncaught GraphQL\Error\InvariantViolation: Query.0 field config must be an array, but got: 0Queries in /home/olup/development/tests/php monorepo/vendor/webonyx/graphql-php/src/Type/Definition/FieldDefinition.php:122
Stack trace:
#0 /home/olup/development/tests/php monorepo/vendor/webonyx/graphql-php/src/Type/Definition/ObjectType.php(151): GraphQL\Type\Definition\FieldDefinition::defineFieldMap(Object(GraphQL\Type\Definition\ObjectType), Array)
#1 /home/olup/development/tests/php monorepo/vendor/webonyx/graphql-php/src/Utils/TypeInfo.php(180): GraphQL\Type\Definition\ObjectType->getFields()
#2 /home/olup/development/tests/php monorepo/vendor/webonyx/graphql-php/src/Type/Schema.php(213): GraphQL\Utils\TypeInfo::extractTypes(Object(GraphQL\Type\Definition\ObjectType), Array)
#3 /home/olup/development/tests/php monorepo/vendor/webonyx/graphql-php/src/Type/Schema.php(199): GraphQL\Type\Schema->collectAllTypes()
#4 /home/olup/development/tests/php monorepo/vendor/webonyx/graphql-php/src/Type/Schema.php(153): Graph in /home/olup/development/tests/php monorepo/vendor/webonyx/graphql-php/src/Type/Definition/FieldDefinition.php on line 122