Question SS Unable To Flash zips

I have created a rom slot using safestrap with sufficient size and also have the rom slot active. When I try to flash a .zip file to the rom slot it instantly says "Unable to load .zip file" I have tried to uninstall and reinstall safestrap. I have also tried multiple .zip files, tried loading from both internal and external sdcard, also tried reformatting the sd card,. I am totally stuck at this point, any ideas?