Null pointer errors are java saying "something has gone wrong and I don't really know what". It looks like you were simply visiting a dashboard, but is it one broken gadget, or the whole page? What gadgets are on that page, and if it's only one that is breaking, what is the type of gadget?
You will need to explain what you were doing at the point at which the error happened, and go into the log to fetch us the *whole* error - your screen shot only gives us the first part of it.
thanks for your input.
what has change is that i've assigned issutype scheme to additional project.
after that issue occurred.
unfortunately, i have not rights to see "system administration" data.
Hopeful data provided will be enough
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