ERROR com.appiancorp.common.struts.BaseAction - Error executing action: null

ERROR com.appiancorp.common.struts.BaseAction - Error executing action: null
07:42:33,155 INFO [stdout] (http-/0.0.0.0:8080-5) java.lang.NullPointerException
07:42:33,156 INFO [stdout] (http-/0.0.0.0:8080-5) at com.appiancorp.asi.components.common.BackgroundAction.main(BackgroundAction.java:174)
07:42:33,156 INFO [stdout] (http-/0.0.0.0:8080-5) at com.appiancorp.common.struts.BaseViewAction.executeImpl(BaseViewAction.java:125)
07:42:33,157 INFO [stdout] (http-/0.0.0.0:8080-5) at com.appiancorp.common.struts.BaseAction.execute(BaseAction.java:450)

This error happened when there is no operations on appian site. Anyone can give an advice? The appian7.5 and EAP 6.2 are newly installed. Is there something missed during configuring? Already attach error trace. ...

error.log

OriginalPostID-113783

OriginalPostID-113783