Problem with stand alone mode

[Javi]

I'm using POSnet in stand alone mode (I'm only overwrite files in latest version of POS with latest version of POSnet (posnet4.zip)). Network configuration is with no path and "LOCAL" (L), "Go to after sale" is in "THE NEXT SALE" mode. At the end of a sale (+ [ENTER] [ENTER]) the program crashes and give me this message "File already open in line 3 of module POS2 at address 1B74:9487
Hint any key to return to system"

Suggestions?

Best regards