Why fails the testrunner when a error occured before?

My tests are a mix of running a SoapUI testcase with Testcomplete and then checking the database entries with a script.

Now, as soon, as one of my scripts sends an error, after each further SoapUI testcase call, the testrunner reports "The test has failed. See Additional Information for details.", even if there was no error in the SoapUI testcase at all.

And at the end, if just one error occurs, I have in the log a number of errors reported, where one is a real one and the others are just the number of runs of SoapUI testcases which followed after one real error occured.

Here is a part of the additional info of the testrunner, which thinks he failed:

SoapUI 5.1.3 TestCaseRunner Summary
-----------------------------
Time Taken: 1161ms
Total TestSuites: 0
Total TestCases: 1 (0 failed)
Total TestSteps: 3
Total Request Assertions: 4
Total Failed Assertions: 0
Total Exported Results: 3

That mixes my reports really up and makes it hard to find the real errors.