There are probably many different issues that can cause this error in the Calamari WebUI. However this fixed worked for me. Note that this was post install and OSD deployment… I did not have a working cluster at this point.
First ssh into your Admin node, in this case my admin and monitor node are on in the same.
Then run the command below.
root@mon01 calamari]# calamari-ctl clear
[WARNING] This will remove all stored Calamari monitoring status and history. Use ‘–yes-i-am-sure’ to proceed
OK, now run the command above again with the “–yes-i-am-sure‘ option.
[root@mon01 calamari]# calamari-ctl clear –yes-i-am-sure
[INFO] Loading configuration..
[INFO] Dropping tables
[INFO] Complete. Now run `calamari-ctl initialize`
Now reinitialize Calamari.
[root@mon01 calamari]# calamari-ctl initialize
[INFO] Loading configuration..
[INFO] Starting/enabling salt…
[INFO] Starting/enabling postgres…
[INFO] Initializing database…
[INFO] Initializing web interface…
[INFO] Starting/enabling services…
[INFO] Restarting services…
[INFO] Complete.
Refresh the Calamari WebUI and the error should be gone, or at least it was for me.