Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. code example

Example: touchableopacity expected a string

This is probably caused by some JS module export/import issues
in your program, typically for one of the two reasons listed below:

- You forget to export, or you export something incorrectly
- You import something that doesn't exist, or you import something incorrectly