WebIDE deployment dump (500 SAP Internal Server Error)

Hi community!

We have a SAP NW 7.0 EHP3 SP18, and have recently installed all the UI5 and Fiori products for our version (Fiori ERP Applications X2, SAP UI Add-On, SAP Fiori Front-End Server). We should be all set and ready to start creating UI5 apps.

However when I tried to deploy our first app to the SAPUI5 ABAP repository from the WebIDE, I encountered the error 500 SAP Internal Server Error (see below images):

For the connection to our on-premise system I have configured the SAP Cloud Connector and the destination in the HCP (I can connect to the on-premise system without a problem).

I saw that in my ABAP system it shows it as a MOVE_CAST_ERROR.

Has anyone had this experience before and how did you fix it?

Thanks a lot,

Sashko.