AWX on K3s - Instance group - Inventory permission denied

I have awx installed through k3s.
I have configured an instance group with two instance eexecution nodes, one of which is attested on a dmz.
For testing, I left only the instance node active in dmz. Quado I run a template using the instance group, however, I get the following error:

unable to read either as JSON nor YAML, these are the errors we got from each:
JSON: Expecting value: line 1 column 1 (char 0)  Syntax Error while loading
YAML.   did not find expected key  The error appears to be in
'/runner/inventory/hosts': line 3, column 91, but may be elsewhere in the file
depending on the exact syntax problem.  The offending line appears to be:  #
-*- coding: utf-8 -*- print('{"all": {"hosts": ["server1",
"server2"]}, "_meta": {"hostvars":
{"server1": {"remote_host_enabled": "true",
"remote_host_id": 167, "remote_tower_enabled": "true", "remote_tower_id": 167},
"server2": {"remote_host_enabled": "true",
"remote_host_id": 166, "remote_tower_enabled": "true", "remote_tower_id":
166}}}}')
^ here We could be wrong, but this one looks like it might be an issue with
unbalanced quotes. If starting a value with a quote, make sure the line ends
with the same set of quotes. For instance this arbitrary example:      foo:
"bad" "wolf"  Could be written as:      foo: '"bad" "wolf"'
[WARNING]:  * Failed to parse /runner/inventory/hosts with ini plugin: host
range must be begin:end or begin:end:step
[WARNING]: Unable to parse /runner/inventory/hosts as an inventory source
[WARNING]: Unable to parse /runner/inventory as an inventory source
ERROR! No inventory was parsed, please check your configuration and options.

If I deactivate the instance node in DMZ and activate the other one present in the instance group the error does not occur

What could be the problem?

Resolved. Problem related to restrictions on /tmp filesystem.