Hidden OS doesn't boot and displays an error after the decoy system is installed

[Jack Black]

I am trying to use the hidden OS feature. I am able to install the hidden OS (even restart and boot it and Windows works fine) but when I continue and try to install the decoy OS (on a partition which was wiped), I can boot the decoy OS but cannot boot the hidden OS anymore - when I enter the password for the hidden OS I get:

drive 0x80(LBA) C/H/S=[numbers], Sector Count/Size=[numbers]
Partition num: 0, active, Filesystem type unknown, partition type 0x07
Partition num 1, Filesystem type unknown type 0x06

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Options if your HDD is larger than 1TB:
* Move your boot files to a smaller [...]
[THE WHOLE HELP TEXT IS PROBABLY NOT APPLICABLE BECAUSE MY PARTITION IS NOT LARGER THAN 1TB]

1. How do I solve the problem?
2. Is there a solution that doesn't require repeating the whole process of creating a hidden OS (it takes a few hours)?
3. I will try using Truecrypt 7.1a tomorrow if nothing helps, do you think this issue will persist?

[Mounir IDRASSI]

Your error is very strange...the error message your posted doesn't come from VeraCrypt or Windows but from "Grub" bootloader that seems to be confused.

Knowing that VeraCrypt nor Windows use or install Grub, this leaves the question of how you ended up with a Grub bootloader for your hidden OS.
Can you please explain how you ended up in this configuration? Clearly you didn't use the standard Windows formatting/installation process and this is something not supported in VeraCrypt nor TrueCrypt.

[Thhf Dsaa]

This Thread is old, but someone got a solution?
I'm searching for hours, but I find no solution to fix it on my hidden OS. I can start my decoy OS.
Everything is like in the first post.