Sheetnode Multisite Javascript error message: 'Unknow line type '' '
SOLUTION:

It seems obvious now but... if you have the same problem with any other module, just look at the source code.

If you see a lot of white space at the beginning, it's a clue.

Someone might have inadvertently left a closing php tag ('?>') somewhere in his code.

Someone doing copy/paste from online example/sources....

Anyway..I pulled my hair but learned some knowledge. No hard feeling to my colleagues ! ;)