Question : SSRS report error.An error has occurred during report processing. ExecuteReader: CommandText property has not been initialized

I get the following error when this is deployed on to our reporting server
But works fine on my local machine

An error has occurred during report processing.
Query execution failed for data set 'dsSummary'.
ExecuteReader: CommandText property has not been initialized

Answer : SSRS report error.An error has occurred during report processing. ExecuteReader: CommandText property has not been initialized

I believe the data source is case insensitive