Invalid Object type - Concatenation

Hello Everyone -

Fist time caller here....I'm new to PBCS scripting and I need a hand with an error.

I am trying to create a FIX statement using concatenate to automatically isolate member "L1", "L2", "L3", etc.

However, I am getting the following error. Can someone please point me in the right direction? Thanks!

"A validation error was received from the Planning server.

'Error:Error parsing formula for [FIX STATEMENT] (line 38): invalid object type"

/*Code snippet*/

var bline = 1;

Loop({varLoopCnt})

 Fix(@MEMBER(@NAME(@CONCATENATE("L", @HspNumToString(bline)))))

... ... ...

bline = bline + 1;

ENDFIX

ENDLOOP