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Description of problem:

Cockpit is not showing useful/meaningful error messages in "image builder" tab.

After fresh installation OR if "lorax-composer.service" is stopped, cockpit just show below error.
----
An Error Occurred
not-found
----


Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1. Install lorax-composer, cockpit services
2. systemctl stop lorax-composer.service
3. Goto cockpit WebUI > image-builder > "An error occured"

Actual results:

"An error occured"

Expected results:

"Lorax-composer daemon is not running" OR similar

Additional info:



Also, couldn't find any relevant logging under /var/log/messages or "/var/log/lorax-composer/". 

And couldn't find any information in the official documentation of about troubleshooting/logging of cock-pit OR image-builder


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https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/composing_a_customized_rhel_system_image/index

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/managing_systems_using_the_web_console/index
---

This is fixed in cockpit-composer 0.4.

Verified on cockpit-composer-1-1.el8

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2019:3333