You must have this identifier defined somewhere. Type //echo -ag $isalias(ipef2).fname to find out where it is.
Output of:
//echo -ag $isalias(ipef2)
Result: $false
Output of:
//echo -ag $isalias(ipef2).fname
Result: * /echo: insufficient parameters
Edit: The ipef2 variable is defined only in the clone detector script. No other script has this variable.
Edit2: What IS the ipef2 variable? I can find no documentation anywhere on what that variable is, or even do.