Foldermount not working

[AC Question]

I have enough space to download big apps on my phone. But when I try to download foldermount, it says that I don't have enough space on my phone. Foldermount is only 1.30 MB big. This is ridiculous, I can install Facebook, which is 22 MB but I cant install Foldermount. My phone is Samsung Galaxy X Cover 2. Please help