Greetings!

Please contact me in private messages. Provide me with your ID. You can find it in Menu in "About the game" tab. 

Have you tried to create equipment in browser or in mobile version of the game?

You could try to follow the steps below:

- delete all temporary files from your PC which can be found in the following way:
C:\Users\Username\AppData\LocalLow\Plarium
- clear the Plarium Play application cache following this way:
C:\Users\Username\AppData\Local\Plarium\PlariumPlay\Cache
After these steps are done, please reinstall the Plarium Play application.

I have the same issue.  I select Craft and the game crashes with the internal error.  i'm running plarium app on Windows 10 PC.