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Raised when a requested entity (e.g., a file or directory) was not found.

Inherits From: OpError

For example, running the operation could raise NotFoundError if it receives the name of a file that does not exist.

error_code The integer error code that describes the error.
message The error message that describes the error.
node_def The NodeDef proto representing the op that failed.
op The operation that failed, if known.