'<specifier>' is not valid on an interface method declaration

A Function or Sub statement inside an interface contains an invalid keyword, such as Implements. An interface can only define members, not implement them.

Error ID: BC30270

To correct this error

1. Remove the invalid keyword from the declaration statement.

2. Move the implementation of interface members to a class that implements the interface.

See Also

Reference

Interface Statement (Visual Basic)

Implements Statement