Error when executing query without passing variable selection

Hi Gurus

I am getting an error while executing a query with out passing values for variables

When executing the query by passing the filter values report returns the data

When executing the query with out passing variable selections the error message is

Unknown error in SQL interface

Error reading the data of Info Provider ZCRM_O08

Error while reading data; navigation possible

System error in program SSAPLRS_EXCEPTION and form

RS_EXCEPTION_TO_MESSAGE

No Data Available

can any one please help me in resolving this

Thank you