Can't find project or library error with VBA script.

I am having problems with a VBA script I wrote.
It works fine with several versions of Excel (2003, 2010, and 2013).
But the problem arises when I move from Windows XP to Windows 7 or 8.

I use a scanner to scan barcode serial numbers into a textbox, and then populate these serial numbers with other associated data into a spreadsheet.
The serial numbers are supposed to be separated by each line and placed into an array.

I get a compile error "Cant find project or library" with CHR highlighted in blue from this line of code...

SNs = Split(Str, Chr(10))

Once again, it works fine on many machines with XP, but not on Win 7 or 8.

Any help would be appreciated.

Thank you.
Glenn

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I would like to thank both for the quick reply. The Tools, References, MISSING was the one that did the trick.

And the other clean up helped too.