Strange error during Scan, can't mount my ext4 hdd

Failed to execute command '[ -x /sys/class/scsi_host ] && for hostdir in /sys/class/scsi_host/host*; do echo "- - -" | tee ${hostdir}/scan >/dev/null; done':

Errore #4000:
exception 'OMVException' with message 'Failed to execute command '[ -x /sys/class/scsi_host ] && for hostdir in /sys/class/scsi_host/host*; do echo "- - -" | tee ${hostdir}/scan >/dev/null; done': ' in /usr/share/openmediavault/engined/rpc/diskmgmt.inc:356
Stack trace:
#0 [internal function]: OMVRpcServiceDiskMgmt->rescan(NULL, Array)
#1 /usr/share/php/openmediavault/rpcservice.inc(125): call_user_func_array(Array, Array)
#2 /usr/share/php/openmediavault/rpc.inc(79): OMVRpcServiceAbstract->callMethod('rescan', NULL, Array)
#3 /usr/sbin/omv-engined(500): OMVRpc::exec('DiskMgmt', 'rescan', NULL, Array, 1)
#4 {main}