Can't turn off FileVault

I want to turn off FileVault, but the machine just present me with an "error" and tells me that it will be turned on again. This is after i have type my password.
Can you help ?

Hi Franne500;
How much free space do you have on your system disk?
In order to turn off file vault it is necessary for the system to decrypt everything. To do that it will need like 50 % of the drive free. If you don't have that it may not be able to decrypt your files for you.
Allan

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