undeclared variable

Hi All,

I am trying to validate the script and I see the below error , Please help me resolving it.

[Script:T_Pre-Processing]

The script <T_Pre-Processing> contains an invalid expression. Additional information: <Referencing an undeclared variable <$GV_FILE_NAME>. Declare the variable in the context that it is being used.>. (BODI-1111242)