Primavera P6 Error : AVAA0-1519-5

Hi Everyone,

I am facing a unique Event Code AVAA0-1519-5. 

I face this event code when I try to delete any activity or relationship in my schedule. And sometimes, I am unable to change the layout.

In addition to this, I am unable to exit P6.

We have Citrix based Primavera P6.

I changed two PCs and P6 was efficiently working till I logged out and logged back in. I have restarted my PC several times but still facing the same issue again.

Surprisingly, if I use my colleague's PC (his login in his PC) and my login for P6, I can use P6 without any issues.  

Please guide to fix this issue.

Thanks

Jigar