The function DocumentDirectory() works fine when called at the canvas.

When called in a function body, then I get an error message, saying that the object pointer was not set to an object instance.

BTW, the GUI is set to english, SMath has been closed and re-opened. Still the error message is in german. Sorry for that.

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The function DocumentDirectory() works fine when called at the canvas. ...

Hi Martin. The issue is because the line() statement. Without it DocumentDirectory() and other functions works fine.

As a workaround for the case that you need to use it with inside a line statement, and given that DocumentDirectory() just use the same argument "" always, you can save it into a constant, but could have others issues, like using that with include().

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Best regards.
Alvaro.