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The following page has been changed by SriranjanManjunath: http://wiki.apache.org/pig/PigErrorHandlingFunctionalSpecification ------------------------------------------------------------------------------ ||2171||Expected one but found more then one root physical operator in physical plan. || ||2172||Expected physical operator at root to be POLoad. Found : <PhysicalOperator>|| ||2173||One of the preceding compiled MR operator is null. This is not expected.|| + ||2174||Internal error. Could not create the sampler job. || ||2998||Unexpected internal error.|| ||2999||Unhandled internal error.|| ||3000||IOException caught while compiling POMergeJoin||