Ubuntu Installation error?

So I have been trying to setup a dual boot with windows, and trying to do a custom installation with the disk allocation thing. I have allocated about 44GB of Free space, but when I go select it through the Ubuntu installation setup, the Next button doesn't light up, nothing I tried does anything. Please Help!

https://preview.redd.it/qeovd1xuonmg1.png?width=1888&format=png&auto=webp&s=68dc60f7ff86dd488674e96d0c1f82181595529e

https://preview.redd.it/b89dat22pnmg1.png?width=1084&format=png&auto=webp&s=482ff8f29200c468af18664fb73ed5a854f5c0d4