A developer has created a file system in the Oracle Cloud Infrastructure (OCI) File Storage service. She then launches an Oracle Linux compute instance and mounts the file system successfully on this instance. The next day, she tries writing to the file system from the compute instance using the following command: touch /mnt/yourmountpoint/helloworld.txt But receives an error message: touch: cannot touch '/mnt/yourmountpoint/helloworld.txt': Permission denied What might be the reason for this error?