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Description of problem:
Prepare a VM which is in installation, then switch to the VM detail page and click the "Remove" button of cdrom. There will be an error shown under VM name, and it can not be closed

Version-Release number of selected components (if applicable):
cockpit-234-1.el8.x86_64
cockpit-machines-235-1.el8.noarch
libvirt-dbus-1.3.0-2.module+el8.3.0+6423+e4cb6418.x86_64

How reproducible:
100%

Steps to Reproduce:
1 Prepare a VM which is in installation
2 Switch to the VM detail page and click the "Remove" button of cdrom

Actual results:
1 There will be an error shown under VM name, and it can not be closed

Expected results: 
1 The error can be closed

Additional info:

This was fixed upstream with https://github.com/cockpit-project/cockpit/pull/15154/commits/859f1ac44c89b3c00c29649599fad95437f5bf68

Pre-verified Versions:
cockpit-machines-236-1.el8.noarch
cockpit-236-1.el8.x86_64
libvirt-dbus-1.3.0-2.module+el8.3.0+6423+e4cb6418.x86_64

Pre-verified Steps:
1 Prepare a VM which is in installation
2 Switch to the VM detail page and click the "Remove" button of cdrom

Pre-verified Results:
1 The error can be closed

According to the results, change ‘Verified’ status to ‘TESTED’.

Test Versions:
cockpit-machines-237-1.el8.noarch
cockpit-236-1.el8.x86_64
libvirt-dbus-1.3.0-2.module+el8.3.0+6423+e4cb6418.x86_64


Test Steps:
1 Prepare a VM which is in installation
2 Switch to the VM detail page and click the "Remove" button of cdrom

Test Results:
1 There will be an error shown. The error can be closed.

According to the results, move the status to VERIFIED.

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 (cockpit-appstream bug fix and enhancement update), 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/RHBA-2021:1875