[TWRP] Failed to unmount /preload (invalid argument)

Hello,

I use TWRP in version 3.0.2.6 on my HTC 10 (android 6.0.1) and every time I try to install a zip or backup my phone, I have this warning in red :

Failed to unmount /preload (invalid argument)

Can you explain me why and how to fix it ?

Thanks

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