Ansible Collection for Unity v1.5.0 -- get error while get /set pool values

I 'm following documentation as described here to get/set Pool threshold information.
https://github.com/dell/ansible-unity/blob/1.5.0/docs/Product%20Guide.md#storage-pool-module

I get the following error when I run the ansible collection for Unity version 1.5.0 when I try to get pool
--snip--
failed: [hst01] (item={'StorageName': 'hst01', 'PoolID': 'pool_1', 'PoolName': 'Pool0'}) = {"ansible_loop_var": "item", "changed": false, "item": {"PoolID": "pool_1", "PoolName": "Pool0", "StorageName": "hst01"}, "msg": "The parameter pool_name length is 0. It is too short. The min length is 1"}
--snip--
What can I do to fix this ?,