We keep getting error messages in Enterprise Manager can anyone explain them?

Error Switch to default layout because requested layout is null

Error Default layout is null

Error Exploring failed at Body, for child List

Error Output resolution: 280

Error Image size is exceeding the limit of 3495253 pixels.  Adjusted output to 2224 pixel * 1571 pixel in 190.17577197149643 dpi

Error IAU:Unable to write Audit Event for Type: xmlpserver

Error  Error in new interactive engine : Rendering failed for IR_DATA_FIELD with null

Error  Number of nulls: 100 against total record count: 100

Error  Monitoring/Audit: event not recorded as event monitor is not active

Thanks for any help

Martin