SSRS 2008 Migration Issue in Report

Question

Dear all,

We are working on Migration process for SSRS 2005 to SSRS 2008.

We have done this work and reports are working fine with ssrs 2008.

But fiew of reports got the below error. Could you please help me on this.

 

An error occurred during client rendering.

An error has occurred during report processing.

The processing of Parent for the tablix ‘tblXyzabc’ cannot be performed. The comparison failed. Please check the data type returned by the Parent.

 

 

Thanks in advance.