Error when CPE 521 use CSS520

2015-01-23T16:59:04.784 0D6E50EC CBR  FNRCE0000E - ERROR 0 -327122417 [CSECascadeCollection] [isCollectionExist] Failed to check existance of index OS1_Document_20150123165904_6BA84D17C5B345889253D195EED93232
2015-01-23T16:59:04.784 0D6E50EC CBR  FNRCB0035W - WARN Could not create index:OS1_Document_20150123165904_6BA84D17C5B345889253D195EED93232 path:/data/CSSIndexArea \ncom.filenet.api.exception.EngineRuntimeException: FNRCB0035E: CBR_TS_ACCESSING_INDEX_FAILED: An IBM Content Search Services server could not access the OS1_Document_20150123165904_6BA84D17C5B345889253D195EED93232 index or the directory that contains the index. Message was: IQQD0027E This action type is not supported.\n at com.filenet.engine.cbrspi.cssimpl.CSECascadeCollection.isCollectionExist(CSECascadeCollection.java:226)\n

have to upgrade CSS to 521