Here's why it's likely an error:
* "On" requires a prepositional object: The word "on" needs something following it to complete its meaning. For example, "on the table," "on the phone," "on time," etc.
* "Or" acts as a conjunction: It connects words, phrases, or clauses.
Possible Corrections:
To understand what the intended meaning might be, we need more context. Here are some possible corrections, depending on the intended meaning:
* "On and": This could be used to indicate a combination or sequence of actions or events.
* "Or" with a complete phrase: The "or" could be used to offer an alternative, but it should be followed by a complete phrase. For example: "Do you want to go to the park, or stay home?"
* "On" with a prepositional object: If the intended meaning is to describe a location or state, the "on" needs a prepositional object. For example: "The book is on the shelf."
It's important to provide context to determine the correct meaning and how to correct the phrase.