Can't mount after lvreduce :(

Hi all,

Using proxmox since 2 months and want to make backups but need space...so i follow procedure to reduce the size of the LVM /dev/mapper/pve-data

but now

mount /dev/mapper/pve-data /var/lib/vz
mount: wrong fs type, bad option, bad superblock on /dev/mapper/pve-data,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so

vgdisplay
--- Volume group ---
VG Name pve
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size 1.80 TiB
PE Size 4.00 MiB
Total PE 471675
Alloc PE / Size 190720 / 745.00 GiB
Free PE / Size 280955 / 1.07 TiB
VG UUID p9Fbxe-sdIR-3ErB-hslp-WxeN-ralD-XRGE0P

lvdisplay
--- Logical volume ---
LV Name /dev/pve/data
VG Name pve
LV UUID w7z87w-sRdO-yCS0-VJJW-thoy-JQyp-wrRYzS
LV Write Access read/write
LV Status available
# open 0
LV Size 745.00 GiB
Current LE 190720
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0

Can someone help me ?

e2fsck does not help

Thanks in advance

smartins