getting error while processing one of my dimension (size specified for a binding was too small, resulting in one or more column values being truncated)

Hi

I'm processing one of my dimension it gives me error

Errors in the back-end database access module. The size specified for a binding was too small, resulting in one or more column values being truncated. Errors in the OLAP storage engine: An error occurred while the 'Last Local Call Time' attribute of the 'DW Vicidial List' dimension from the 'AUS_SSAS' database was being processed.

Server: The operation has been cancelled. Errors in the OLAP storage engine: An error occurred while the 'Phone Number' attribute of the 'DW Vicidial List' dimension from the 'AUS_SSAS' database was being processed.

Kindly help me to resolve this issue.