I'm trying to create a new portal for an application built on Theme Cosmos and with Constellation UI. But when I switch to app studio and go to Channels and create on Portal icon nothing happens. When I traced this the below error is captured in tracer

The page or property D_pxAppViewTypes.pxResults(1) is read-only, and cannot be modified.  Calling method: com.pega.pegarules.data.internal.clipboard.ClipboardPageImpl.remove(String, boolean, boolean, boolean)  Details: (none)