The format for "{field}" can't be "{value}". "{field}" must be all numbers after the prefix "{prefix}". Please use the correct "{field}" format and try again.

Why did this happen?

This error occurs when you put a string in an ID field that's not an ID format.

How do I fix it?

When you input a string in an ID field, the ID should be in the following format: "cg:12345", where "cg:" is the prefix and "12345" is the actual ID.

* Nguồn: Facebook