Hello, I would appreciate if someone could help me understand this warning.

When I validate an amp page through google amp validator it gives me this warning

Missing or invalid structured data item
A required property in your structured data is missing, misspelled, or has an invalid value.
TEST YOUR STRUCTURED DATA

However, when I click the link at the bottom of that warning no errors/warnings show up in the microdata validation tool.

Thank you.

[edited by: not2easy at 4:24 am (utc) on Mar 4, 2018]
[edit reason] no links please [/edit]