Error while using RQM Execution Tool

Hi Experts,
We are facing the following error while executing a Test Suite using the RQM execution Tool.The test is completed successfully in RQM however we get an error at the end. RQMExecutionToolLog.log is below.Has somebody encountered the same and found the root cause?

23:27:18,907 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Processing Command Line arguments for Test Execution

23:27:18,909 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Using passwordFile: C:\Tools\RQM-Extras-ExecutionTool-6.0.5\pwd.txt

23:27:19,259 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Logging in to the server

23:27:19,369 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Successfully created an HTTP client

23:27:21,993 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Connection to RQM Server is established

23:27:22,721 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Using project: Projects ABCD alias: ProjectPlay_Ba+%28Qualit%C3%A4tsmanagement%29

23:27:22,922 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Using stream id: _WbevAOedEeWRV7PM2vrZTw

23:27:22,923 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Execute Execution Command

23:27:22,924 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Processing input parameters for TestSuite Execution

23:27:22,926 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Building POST parameters for TestSuite Execution

23:27:22,927 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Starting execution

23:27:23,374 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - <testsuiteResultId>1084</testsuiteResultId>

23:27:23,375 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Execution instance created on server with Test Suite Log Id 1084

23:27:23,377 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Testsuite Execution started

23:27:23,845 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Execution is in progress: 0%

23:27:34,518 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Execution is in progress: 0%

23:27:45,229 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Execution is in progress: 0%

23:27:55,896 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Execution is in progress: 20%

23:28:06,574 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Execution is in progress: 20%

23:28:17,245 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Execution is in progress: 20%

23:28:27,917 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Execution is in progress: 40%

23:28:38,589 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Execution is in progress: 40%

23:28:49,253 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Execution is in progress: 60%

23:28:59,956 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Execution is in progress: 60%

23:29:10,631 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Execution is in progress: 60%

23:29:21,483 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Execution is in progress: 80%

23:29:32,158 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Execution is in progress: 80%

23:29:42,833 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - Test suite execution completed with status incomplete

23:29:42,834 [main]  INFO com.ibm.rqm.executiontool.ExecutionUtility         - An unknown error occurred. For details, see the log.

Below is the command format
"C:\Program Files\Java\jre8\bin\java" -jar RQMExecutionTool.jar -tserId=520 -projectName="Projects ABCD" -publicURI=https://rb-ubk-clm-04.de.xyz.com:9443/qm -user=abc5klm -passwordFile=C:\Tools\RQM-Extras-ExecutionTool-6.0.5\pwd.txt -adapterIdForAllSuiteStep=14 -verbose=true -exitOnComplete=true