Hello,

"testoutput" must be a string.
So change it to:

testoutput = "10"

"testoutput" muss eine Zeichenfolge sein.
Ändern Sie es also in:

testoutput = "10"

The problem is in line 10 and not in line 12.
It seems to be ';' (wrote in black instead of red).
I guess that ";" is not allowed. Try with "," or "\t" (for Tab).

Or maybe try this:

"SEPARATOR = '" + ";" + "', MODE = WO, fullpath"

OUTPUT braucht KEINE Klammern!

Hier die angezeigte Syntaxhilfe. Einfach mal lesen!

OUTPUT writes data into an external database text file.

Syntax
OUTPUT channel, recordID, fieldID, expression1 [, expression2, ...]

Parameters
channel: the channel which was opened with OPEN.
recordID (numerical or string): the string or numeric ID of the starting position of the writing.
fieldID (integer 0 or 1): 1 creates or modifies an entry, 0 deletes an existing line.
expression (string): Writes as many values into the file identified by the channel value from the given position as there are defined expressions. There has to be at least one expression. The type of values is the same as those of the expressions.
Usable since script version 1.3 (Allplan 2013-1).