The installer failed to resize partition dev/sda1 on disk

I have windows 10 and am trying to dual boot with Manjaro. I manually partitioned my disk and when I clicked on install, it says that I cannot resize the partition /dev/sda1 on my disk. Can you guys help me with this? Thank youuu!!

Welcom here, @jrlegarte :tada:

There is a good tutorial:

When you shrink your win partition (from within win) to make room for manjaro just create ‘unallocated space’, then use the installer’s partitioner to create manjaro’s partitions.

…on said “unallocated space”.

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