Error when reading description for mode-of-transport category

What causes this issue?

The description of the mode of transport category is required to output
or transmit the dangerous goods data. However, this could not be read
by the system.

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?

Contact your system administrator.

Error message extract from SAP system. Copyright SAP SE.