Cannot read the next data row for the data set

I have followed all the links posted on this forum regarding this error and done evrything that has been suggested, but still I am getting this error.

An error has occurred during report processing.

Cannot read the next data row for the data set dsXXXXX.

Invalid attempt to NextResult when reader is closed.

Please help.

In the Report Manager in the upper right hand corner, click on the “Site Settings”.
On the resulting page in the textbox labeled “Limit report execution to the
following number of seconds: ” Increase this time out setting to 4000 (or adjust
this time as necessary).

Also refer : http://msdn2.microsoft.com/en-us/library/aa274413(SQL.80).aspx

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I have followed the documentation and changed the timeout setting to 6000. It was running for a while but at the end it gave me the below error.

An error has occurred during report processing.

Cannot read the next data row for the data set dsTestMbrtEarn.

Invalid attempt to NextResult when reader is closed.