Execution Tool: How to debug executing tcers without tcerId

Hi!

I'm struggling in making Execution Tool choose TCER based on testCaseID and testPlanId.

I managed to fill in result for a given tcerId, so i'm pretty sure the id's i'm working with are good, but i would need to fill in a result for a TCER which id i do not know, but knowing the tc and tp ids.

Here's what i'm using:

/bin/java -jar RQMExecutionTool.jar -verbose=true -testCaseId=15988 -testPlanId="357" -projectName='proper_name' -publicURI="https://rqm.project.sys" -resultState=com.ibm.rqm.execution.common.state.failed -testEnvironment="test_environment name_from the_test_plan" -currentIteration=true -runLastCreatedER=true

The error i'm getting is:

Execute Execution Command
Processing input parameters for TestCase Execution
Finding TCER Id for testCaseId: 15988
Exception occurred while doing a post to the server with the URL:https://rqm.project.sys/service/com.ibm.rqm.execution.common.service.rest.ITestcaseExecutionRecordRestService/findExecutionRecordByTestCaseAndTestPlan
Exception occurred while finding Test Case Execution Record ID: Please verify that the values for parameters testCaseId/testSuiteId, projectName are valid and exist.
An internal error occurred. For details, see the log.

The error is not so meaningful to me. Is there a way to gather more info?