fsck

hello, cant run fsck -fy

if i try i get this

fsck

** /dev/rdisk1 (NO WRITE)

Can't open /dev/rdisk1: Permission denied

/dev/rdisk1 (hfs) EXITED WITH SIGNAL 8

here is my diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *250.1 GB disk0

1: EFI 209.7 MB disk0s1

2: Apple_CoreStorage 249.2 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Macbook *248.9 GB disk1

i do have filevault on