DATASOURCE_ERROR A datasource error occurred during processing of Event Data Service request: 'NCWDataSourceException'

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After opening "Active Event List (AEL)" in Netcool WebGUI, we got the following error:
A datasource error occurred during processing of Event Data Service request: 'NCWDataSourceException'

DATASOURCE_ERROR Netcool WebGUI

in our situation, the cache directories were corrupt.

Solution:

$TIPHOME/profiles/TIPProfile/bin/stopServer.sh server1 -username tipadmin -password <PW>

$TIPHOME/profiles/TIPProfile$ mv temp old_temp 
$TIPHOME/profiles/TIPProfile$ mv wstemp old_wstemp 

$TIPHOME/profiles/TIPProfile$ mkdir temp
$TIPHOME/profiles/TIPProfile$ mkdir wstemp 

$TIPHOME/profiles/TIPProfile$ chmod 775 temp 
$TIPHOME/profiles/TIPProfile$ chmod 775 wstemp 

$TIPHOME/profiles/TIPProfile/bin/startServer.sh server1 -username tipadmin -password <PW>

In our server $TIPHOME = /opt/IBM/tivoli/tip