Skip to main content

This content has been archived and is no longer being updated. Links may not function; however, this content may be relevant to outdated versions of the product.

Support Article

404-error on css



The Designer Studio is sporadically not rendering correctly; and we see corresponding HTTP 404 errors regarding CSS files in the logs.

Here is an example screenshot of what is seen instead of the usual Designer Studio screen: (Screenshot if from Firefox).

Note: It was found that Firefox and Chrome browsers show similar results to the screenshot above when the issue is present: it was found that Internet Explorer may render the issue differently.

Error Messages

2015-02-11 13:01:25,251 [ WebContainer : 2] [ STANDARD] [ ] (ticcontent.StaticContentClient) ERROR - 404 on request: /OALFpahD0ZRP3etG7NtAKR29eVUPuyxLpBoc-Tm1SyY[*/webwb/pzskinv2_pzdesignerstudio_e274d6b1d99b8 
873b2a0f79102cd267ad0540edfa641ed958d7099ff60b63bf3_0--4_1706179809.css!!.css; Referring URL: http://xxxx/prweb/PRServlet/OALFpahD0ZRP3etG7NtAKR29eVUPuyxLpBoc-Tm1SyY%5B*/!STANDARD?pzPostData=812216027; Requestor ID: HB429B1AFFCAD0984AF5E65ADC15BD64A

Steps to Reproduce

The issue will appear to happen randomly : this is due to the fact that an Agent running in the background is responsible for clearing out unused Static Content  - the Activity that the Agent runs was found to be deleting CSS files needed by Designer Studio (they were being identified as 'unused' incorrectly by the Agent).

Root Cause

The root cause of this problem is a defect in Pegasystems’ code/rules.

The Activity "
PZDELETEORPHANSTATICCONTENT" (called from the Out-of-The-Box Agent "DeleteUnusedStaticContentFiles") was found to be deleting CSS files that should not have been deleted.

(Note: The Agent was NOT found to *always* delete the CSS files in every run : the internal logic of the Activity and the state of the system (including client-side browser caches) mean the issue is not easily predictable.)


HFIX-22715 should be installed in order to correct the Activity "PZDELETEORPHANSTATICCONTENT" such that it does not delete CSS files needed by the Designer Studio.


Published February 10, 2016 - Updated October 8, 2020

Was this useful?

40% found this useful

Have a question? Get answers now.

Visit the Collaboration Center to ask questions, engage in discussions, share ideas, and help others.

Did you find this content helpful?

Want to help us improve this content?

We'd prefer it if you saw us at our best.

Pega Community has detected you are using a browser which may prevent you from experiencing the site as intended. To improve your experience, please update your browser.

Close Deprecation Notice
Contact us