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The "Self referencing loop" error occurs when attempting to serialize the GraphQL ExecutionResult because the result object contains circular references that cannot be serialized. Circular references occur when two or more objects reference each other in a loop, causing an infinite chain of references. This error usually occurs when trying to convert an object to JSON or other data format that requires a linear (non-circular) structure. To fix this error, you need to remove the circular references in the ExecutionResult object by redesigning the data structure or using a serialization library that can handle circular references.