hi ..i´m trying to upload a new file and everything is fine but i can´t finish because when i make click on upload file appears ´´please selec a category´´, so i try  to select one  but there are not …they don´t appear when i make clic on the category part...,.... what happens?

hi ..i´m trying to upload a new file and everything is fine but i can´t finish because when i make click on upload file appears ´´please selec a category´´, so i try  to select one  but there are not …they don´t appear when i make clic on the category part...,.... what happens?