Document contains incompatible objects

[Exquisite_Enigma5614]

(Using a Translator)

Warning window content:
This cloud document contains objects that are incompatible with the current version of Illustrator.
To open this document, use the version in which the document was created

How do I fix an error that doesn't open the file?

[Monika Gause]

Has the document been created in the same Illustrator version that you are using to open it?