Could not lock table &1

What causes this issue?

Table & cannot be locked. The reason for this may be that you do not
have the authorization to lock tables, that the table is already
locked, or that the table is being processed by a another user.

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?

Error message extract from SAP system. Copyright SAP SE.