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Performance report not shows result

Engaged Sweeper II

I have a Lansweeper Enterprise version installed in a single server and recently I enabled performance scan for 4 computers (months ago I migrated my installation from a Premium version).

When I try to run the builtin report that appear in this link, It shows no records : The performance tab of the asset does not show data either (It shows a Webserver Error: Object reference not set to an instance of an object).

I noticed through of SQL queries that the tsysPerformanceCounterMetric table is empty (instead, the tblPerformance* tables
have data). ¿how can I fix it without reinstall Lansweeper server?

Thanks a lot!!