Failed to parse inventory

Warning
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Errors were encountered while gathering the inventory:
[WARNING]: * Failed to parse /home/student/ourclass5/inventory with yaml plugin: YAML inventory has invalid
structure, it should be a dictionary, got:
[WARNING]: * Failed to parse /home/student/ourclass5/inventory with ini plugin: not enough values to unpack
(expected 3, got 2)
[WARNING]: Unable to parse /home/student/ourclass5/inventory as an inventory source
[WARNING]: No inventory was parsed, only implicit localhost is available
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