Where exactly are you getting this error message? When trying to assign a poller to a node?
- Also what version of NPM are you running? Uupdates to newer versions recently. - This error does come up if you already have a custom poller assigned.
You might try scanning the node to test a poller. If it confirms in the test try a list resources on the node just to see if you are using a SW Poller or a Custom Poller already.
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Crack open the database manager on the server and enter the following, replacing the 'mydatabase' with your database name:
SELECT TOP (1000) [PollerID]
Check data returns.
Run the configuration wizard.