When navigating to a page like Portfolio Kanban, the following error is seen
Could not convert: State to UNABLE_TO_PARSE
This can be caused by a query referencing a state that no longer exists
To resolve this, it will be necessary to locate the offending query.
If this is happening on the Portfolio Kanban board then it's likely that there is a default query specified
If this is occurring on a dashboard or custom page, then it will be necessary to examine the settings on the custom apps and look at the query field to see if there is a reference to an invalid state on any of those app.