Please ignore the error related to the shared folder as it won't affect the VM.
Please try rebooting you Cassandra VM using below command from the terminal.
To start Cassandra in foregrounf mode use the command: "cassandra -f"
To run the whole service use the command: "cassandra"
Now in new terminal ==> start the CQLSH type : "cqlsh"
Hope this helps.
Please try and let us know if you have any query/ if the issue persists.
We are eagerly waiting for your response.