Hier ist noch eine Zusatzinfo aus der log-Datei.

Exception: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.

Was heißt das?

Alide Folz 

Alide Folz said:

Was heißt das?

"The object reference was not set to an instance of an object." is an error message commonly seen in programming languages like C# and .NET when trying to access a variable or object that has not been properly initialized or assigned.  It is equivalent to the "null reference exception" in English.  To resolve this issue, you'll need to ensure that the object or variable is correctly instantiated before trying to use it.

Does that help? I imagine not because the title of the error is so common the cause could be many things.  It's essential that you provide the full error details when you get that because the title alone is about as much use a chocolate teacup!

Alide Folz 

Alide Folz said:

Was heißt das?

"The object reference was not set to an instance of an object." is an error message commonly seen in programming languages like C# and .NET when trying to access a variable or object that has not been properly initialized or assigned.  It is equivalent to the "null reference exception" in English.  To resolve this issue, you'll need to ensure that the object or variable is correctly instantiated before trying to use it.

Does that help? I imagine not because the title of the error is so common the cause could be many things.  It's essential that you provide the full error details when you get that because the title alone is about as much use a chocolate teacup!

Mit dieser Anwort kann ich nichts anfangen, da ich nicht weiß, was genau ich bei den Voreinstellungen falsch gemacht habe.

Alide Folz 

As I said... I doubt that answer will help you at all. It's as helpful as your question.

Please provide the requested detail behind the error.  That might help us more.

Or perhaps you can share the project you have tried to export the file from and also provide the exact steps you followed?  If we can reproduce it then we might have a better chance of finding out why the problem occurs.