XSD resolution failure in IntelliJ

[IndicareLeve]

Hello,
I know that this probably isn't a issue related to this plugin, but i couldn't find help anywhere. If this is inappropriate please feel free to remove and accept my apologies.

I would really like to use intellij instead of anypoint studio because it runs very very bad for me, but without code suggestion is very hard. Can you point me in the right direction? The issue shown in the IDE is the following:

Thank you!