Choose at least one object type

What causes this issue?

At least one object type must be chosen before executing the function.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Choose by positioning the cursor: This choice is only valid when no
object types are selected. Position the cursor on the object type to be
chosen.
Choose by selecting: Select all object types to be chosen. To do this
use the function Select -> Object type.

Error message extract from SAP system. Copyright SAP SE.