Connection error with Compass

I have an error connecting to the M121 sandbox ( with MongoDB Compass 1.15.1:
An error occurred while loading navigation: ‘not master and slaveOk=false’: It is recommended to change your read preference in the connection dialog to Primary Preferred or Secondary Preferred or provide a replica set name for a full topology connection.
No problem using shell with parameters:
Previously Compass was working with no errors.