"Text was truncated or one or more characters had no match in the target code page."

I’m new to SSIS. I meet the following errors after executing the package.

Error: 0xC02020A1 at Data Flow Task, Flat File Source [2]: Data conversion failed. The data conversion for column "Name" returned status value 4 and status text "Text was truncated or one or more characters had no match in the target code page.".

Error: 0xC020902A at Data Flow Task, Flat File Source [2]: The "Flat File Source.Outputs[Flat File Source Output].Columns[Name]" failed because truncation occurred, and the truncation row disposition on "Flat File Source.Outputs[Flat File Source Output].Columns[Name]" specifies failure on truncation. A truncation error occurred on the specified object of the specified component.