# What could be the cause of DUnitX action result "An error occurred whilst attempting to run DUnitX Action. Exit code: 255. Error text: ."
**URL:** https://www.finalbuilder.com/forums/t/what-could-be-the-cause-of-dunitx-action-result-an-error-occurred-whilst-attempting-to-run-dunitx-action-exit-code-255-error-text/5946
**Category:** Bugs
**Created:** [January 4, 2015, 4:59am UTC](https://www.finalbuilder.com/forums/t/what-could-be-the-cause-of-dunitx-action-result-an-error-occurred-whilst-attempting-to-run-dunitx-action-exit-code-255-error-text/5946 "2015-01-04T04:59:48Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@jeroenp](https://www.finalbuilder.com/forums/u/jeroenp)
#### Post date: [January 4, 2015, 4:59am UTC](https://www.finalbuilder.com/forums/t/what-could-be-the-cause-of-dunitx-action-result-an-error-occurred-whilst-attempting-to-run-dunitx-action-exit-code-255-error-text/5946/1 "2015-01-04T04:59:48Z")
**1. Continua version number and edition:**
[Continua](http://80.100.143.119:58080/administration/about) - 1.5.1.69 64 bit
**2. Operating system for Continua and agents:**
Windows 8.1 Pro x64 (both server and agents)
**3. Database platform:**
bundled PostgreSQL
**4. How much CPU / RAM / Diskspace do you have free on the Continua server, agents, and database:**
80% free CPU (dual Xeon VM), 25% free RAM (of 2 gigabyte), 20% free hard disk (of 160 gigabyte)
**5. A detailed description of the issue: **
- What is the issue, and what are the outcomes? See below
- When did the issue first occur? When switching to FastMM4 FullDebugMode.
- Does it occur all the time? Yes
- Can the issue be reproduced? Yes: in both 1.5.1.49 and 1.5.1.69.
- If you are using version 1.5 or greater please include a diagnostics report. See attachment.
- Errors or Warnings generated by Continua (both server and agent) as well as any Windows event logs. Continua info below; no details in the Windows event logs.
- Browser type and version: Version 39.0.2171.95 (64-bit)
- Version and installation details of any external software dependencies (eg git / svn server configuration details): not needed.
- Relevant configuration file settings: eg Authentication settings. Vincent has them.
I’m running on Windows 8.1 x64 (all updates applied) with a non-interarcive service user for both the server and the agent on a single machine.
Vincent has credentials on the machine, but Guest users can view the results.
There is a DUnitX build action which returns an error 255; see the results at [http://80.100.143.119:58080/Spring4…ds/log/770](http://80.100.143.119:58080/Spring4Djwp/ci/builds/log/770) :
| [DUnitX [%NUnitTestBinaryDirectory%%NUnitTestBinaryFileName%.exe]](http://80.100.143.119:58080/Spring4Djwp/ci/builds/log/764?30787af4-0f89-43d4-a73b-a4160007b1d5# "Expand") | 6:29 PM | 6:29 PM | 4 seconds | Failure |
| [Parameters](http://80.100.143.119:58080/Spring4Djwp/ci/builds/log/764?30787af4-0f89-43d4-a73b-a4160007b1d5# "Expand") |
| Working Directory: C:\ContinuaCI\WorkSpace\Ws\764\Source\spring4djwp\Tests\Bin\Delphi2010\Win32\Debug
Executable: C:\ContinuaCI\WorkSpace\Ws\764\Source\spring4djwp\Tests\Bin\Delphi2010\Win32\Debug\Spring.Tests.exe
Arguments: C:\ContinuaCI\WorkSpace\Ws\764\Output\Tests\Delphi2010\Win32\Debug\Spring.Tests.Reports.xml |
| [Environment Variables](http://80.100.143.119:58080/Spring4Djwp/ci/builds/log/764?30787af4-0f89-43d4-a73b-a4160007b1d5# "Expand") |
| No environment variables specified |
| An error occurred whilst attempting to run DUnitX Action. Exit code: 255. Error text: . |
The tests are built with FastMM4 (from SVN).
When I download the artefacts from this build, I can run the tests from the console just fine: [http://80.100.143.119:58080/Spring4…0385330837](http://80.100.143.119:58080/Spring4Djwp/ci/builds/artifacts/770?_=1420385330837) just download Spring.Tests.7z, unpack to %temp% and run the Spring.Tests.exe: works fine.
How can I track down the cause of this 255 error?
–jeroen[\_\_33126\_\_0\_\_ContinuaCI-diagnostics-report-2015-01-04\_16-26-54.zip](https://www.finalbuilder.com/forums/uploads/default/original/2X/a/ace0d0703caf2376ac35e530ed361670bffae4b9.zip) (101.648 KB)
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### Author:  [@jeroenp](https://www.finalbuilder.com/forums/u/jeroenp)
#### Post date: [January 4, 2015, 10:32am UTC](https://www.finalbuilder.com/forums/t/what-could-be-the-cause-of-dunitx-action-result-an-error-occurred-whilst-attempting-to-run-dunitx-action-exit-code-255-error-text/5946/2 "2015-01-04T10:32:56Z")
Found it.
Somehow my other user had this DLL on the path:
- FastMM\_FullDebugMode.dllFastMM FullDebugMode Support DLLPSD / Pierre le RicheC:\Users\Developer\Copy\bin\FastMM\_FullDebugMode.dll
Copying that into the directory of Spring.Tests.exe solves the issue.
It would be nice if Continua CI can generate a more descriptive error, though that might be hard.
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### Author:  [@Vincent](https://www.finalbuilder.com/forums/u/Vincent)
#### Post date: [January 5, 2015, 1:09am UTC](https://www.finalbuilder.com/forums/t/what-could-be-the-cause-of-dunitx-action-result-an-error-occurred-whilst-attempting-to-run-dunitx-action-exit-code-255-error-text/5946/3 "2015-01-05T01:09:12Z")
Thre’s nothing we can do if the process doesn’t write the error out to stderror or stdout. I suspect the exit code 255 is a delphi runtime error but I couldn’t find anything which indicates the exact error.
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### Author:  [@jeroenp](https://www.finalbuilder.com/forums/u/jeroenp)
#### Post date: [January 5, 2015, 1:19am UTC](https://www.finalbuilder.com/forums/t/what-could-be-the-cause-of-dunitx-action-result-an-error-occurred-whilst-attempting-to-run-dunitx-action-exit-code-255-error-text/5946/4 "2015-01-05T01:19:15Z")
In the end I did find it back in the Application event log:
[code]Faulting application name: Spring.Tests.exe, version: 0.0.0.0, time stamp: 0x54a959baFaulting module name: FastMM\_FullDebugMode.dll, version: 6.3.9600.17476, time stamp: 0x54516af9Exception code: 0xc0000135Fault offset: 0x000a36e5Faulting process id: 0x1214Faulting application start time: 0x01d02831b4bfe18aFaulting application path: C:\ContinuaCI\WorkSpace\Ws\770\Source\spring4djwp\Tests\Bin\Delphi2010\Win32\Debug\Spring.Tests.exeFaulting module path: FastMM\_FullDebugMode.dllReport Id: f2aa6a74-9424-11e4-8284-000c29918645Faulting package full name: Faulting package-relative application ID: [/code]
I think ContinuaCI could monitor that and react upon it.
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### Author:  [@jeroenp](https://www.finalbuilder.com/forums/u/jeroenp)
#### Post date: [January 6, 2015, 2:23am UTC](https://www.finalbuilder.com/forums/t/what-could-be-the-cause-of-dunitx-action-result-an-error-occurred-whilst-attempting-to-run-dunitx-action-exit-code-255-error-text/5946/5 "2015-01-06T02:23:07Z")
For my own reference: [https://plus.google.com/+JeroenPluimers/posts/byHJaGopwgH](https://plus.google.com/+JeroenPluimers/posts/byHJaGopwgH)