I assume this is a manual transmission?
can you please clarify what type of assistance you are seeking? do you want to know the cause? the fix? something else?
I will provide an honest answer. I trust this will be appreciated. Please remember that a low rating PUNISHES me for being honest and that I receive nothing for my time until a positive rating is clicked.
this is normally caused by a bad gearbox syncro
unfortunately this requires the gearbox be opened for repair, which is labour intensive and is the only resolution.
please let me know if you have further questions. Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you. Best wishes with your vehicle.