Kivy: Open multiple python scripts - python

i try to open multiple Kivy Python scrpts on my Raspberry Pi 3. (Raspian Jessie)
I can start one script with command line python kivy/examples/widgets/colorpicker.py.
This works awesome.
But if i try to start a second Kivy application with a second Terminal i get the following error (I don't think that this will help much):
For a short time i can see an empty (transparent) Windows with Title "Tutorial". Then it is closing.
Sorry for the stupid question (Kivy Beginner)...
Is this normal?

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Is there a way where I can debug it, or know where the error is exactly? Because when it crashes the only thing I get is a message of 'Python has stopped working'.
I do have some try blocks around the code and as I said, when opened from the IDE the whole program works as expected.
Please let me know if you need more info
Thanks
EDIT: For a bit more context, if I put the whole mousePressEvent() method in a try block it will still crash when I click the on a cell of the table
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Blank python IDLE window when opening python file on macOS

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Issue with cx-freeze application: It is running for only 1 second [duplicate]

This question already has answers here:
Pygame and cx_freeze: segmentation fault
(5 answers)
Closed last month.
I made a game in python, and then exported it with cx-freeze. For some reason, when I try to double-click on the application it opens a command line for about a second and then closes. However, when I run it myself with just the python IDLE it works fine. What am I missing?
If it helps: I have graphic files in a separate folder called data and I'm using the normal python modules + pygame.
If you application is a GUI, you should freeze it with the "Win32GUI" base, so it doesn't open a command line. Have a look at an example in the docs.
I don't know why it's closing again - maybe it's failed to include something it needs. When you freeze it with the GUI base, any error messages should appear in a message box, which might help you work out what the problem is.

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