error exporting images

[scubammx]

hallo i am new on linux and VB ( i run vbox on ubuntu) , , i am trying to EXPORT the machine to try on another system but it gives me this error :

Failed to export appliance /run/user/1000/gvfs/smb-share:server=fritz-nas,share=fritz.nas/Volume/backup vbox/HASSIO2.ova.

Could not create the exported medium 'HASSIO2-disk001.vmdk'.
VMDK: cannot write compressed data block in './HASSIO2-disk001.vmdk' (VERR_DEV_IO_ERROR).


Result Code:
VBOX_E_FILE_ERROR (0x80BB0004)
Component:
MediumWrap
Interface:
IMedium {ad47ad09-787b-44ab-b343-a082a3f2dfb1}

can you help me to understand which is the issue

the error happens at random percentage of the job, if i try to export to pendrive, local or netword drive .

hope someone could help me with suggestions

[mpack]

"Cannot create" and VERR_DEV_IO_ERROR both imply a problem with the drive the OVA is being written to. Possibly write protected, or another common fubar is to write to a FAT32 formatted drive: FAT32 has a 4GB file size limit.