"Chart has been cancelled" O-Chart Error message

[molly21]

After installing o-charts, there are many "grey" areas in the charts, depending on zoom level.
When I zoom in the grey areas are going away and the charts are visible.

I am using windows 10 (clean install on new computer), OpenCPN 5.8.4, O.chart plugin 2.0.1.9


In O-charts plugin I pushed the "Validate chart set" button and got some "chart has been canceled" errors like this:
20: Chart load warning ( C:\CHARTS\oeuSENC-BE_NL_UK\OC-44-A24204.oesu ) : Chart has been cancelled
21: Chart load warning ( C:\CHARTS\oeuSENC-BE_NL_UK\OC-44-

After new download and reinstall the charts I got the same error when doing a o-chart chart validation at some charts.
other o-charts are working fine.

I have done a database rebuilt, but without effect.