How to find out the root cause of "Invalid schema provided"? I have many *.graphqls. Some of them just have data type IDL without any query and mutation definition.
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'schemaParser' defined in class path resource [com/oembedler/moon/graphql/boot/GraphQLJavaToolsAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.coxautodev.graphql.tools.SchemaParser]: Factory method 'schemaParser' threw exception; nested exception is com.coxautodev.graphql.tools.InvalidSchemaError: Invalid schema provided (org.antlr.v4.runtime.InputMismatchException) at: [@313,1904:1904='[',<11>,120:12]