Error in RWB

Hello Everybody,

I am checking the status of my Integration Engine (Proxy Runtime XXX) in RWB and it shows the below error.

Message:

Unable to log on to system PXI in language en with user PIRWBUSER

Stacktrace:

com.sap.aii.rwb.exceptions.OperationFailedException: Unable to log on to system PXI in language en with user PIRWBUSER

at com.sap.aii.rwb.core.XIAbapRTCComponent.getConnector(XIAbapRTCComponent.java:114).....

Can anyone kindly let me know why this error is coming up..

Regards,