Sims with white skin when wearing ccs I created (SOLVED)

Hi everyone, I'm new to this forum and also kind of a new cc designer (only recolouring as for now). I started off by trying to recolour some socks, I opened Sims 4 Studio (version 3.2.0.3), Create Cas Standalone, then CAS, and chose the cas that I want to recolour/texture. Next thing I did is, I click export file and saved the texture diffuse to my pc, then after I finished recolour/texture, I click import and chose the file, and the sim model turn into white immediately right after, wearing the cas items that I imported. I tried putting it into Mods in EA Sims4 file, my sims also turn into completely white when wearing the cc cas. I've read the Common Problems & Helpful Threads Posting, at number 7 of CAS problem, it says incorrect alpha or missing alpha. I gotta be honest here, I'm not that good at computer stuffs, so I have no idea what does that mean nor how to fix this bug, can anyone try to help me?







Notes :



-Texture : I only uploaded Diffuse. Shadow, Normal and Emission are empty, Shadow is there, but I didn't upload anything



-I recoloured the socks on Paint



-My Sims 4 Studio is version 3.2.0.3