Every time I run an 'puppet agent -t' on my node I'll get an error

Hi!

Hi! I've tried the example "Roles and profiles: A complete example" from the official puppet site: https://puppet.com/docs/pe/2017.2/r_n_p_full_example.html#step-1-choose-component-modules

But every time I ran an 'puppet agent -t' on my node I got the following error:

root@puppet-node:/# puppet agent -t

Warning: Unable to fetch my node definition, but the agent run will continue:

Warning: Error 500 on SERVER: Server Error: Could not retrieve facts for puppet-node.local: Failed to find facts from PuppetDB at puppet-master.local:8140: Failed to execute '/pdb/query/v4/nodes/puppet-node.local/facts' on at least 1 of the following 'server_urls': https://192.168.117.20:8081

Info: Retrieving pluginfacts

Info: Retrieving plugin

Info: Retrieving locales

Info: Loading facts

Error: Could not retrieve catalog from remote server: Error 500 on SERVER: Server Error: Failed to execute '/pdb/cmd/v1?checksum=8584d16afc761879e9e79f429029f0a299d2da68&version=5&certname=puppet-node.local&command=replace_facts&producer-timestamp=2019-04-06T20:25:14.303Z' on at least 1 of the following 'server_urls': https://192.168.117.20:8081

Warning: Not using cache on failed catalog

Error: Could not retrieve catalog; skipping run

root@puppet-node:/#

And I don't understand, what I've done wrong !?

Has someone an idea what's wrong?