Drop-down menues on options page on Scarlett theme

Hi everybody,

i just upgraded to version 2.8 and installed the scarlett theme. on its options page id like to make a few adjustments but the drop-down menues only show me the “select category” and that is it. i cannot choose from a category since they are missing. does anybody have an idea how this could be solved or is there a way for me to manually save the category somewhere.