Sketch question: can't get the export to work - it just opens an empty checkerboard page (index.html). It that because I just copied the "Export to Framer.jstalk" file to Sketch's plugin folder? I tried following the instructions on the Github page, but the terminal command to clone the repository ("git clone firstname.lastname@example.org:bomberstudios/sketch-framer.git") returned Permission denied. Instead I just downloaded the zip from Github, and copied the "Export to Framer.jstalk" file into Sketch's plugin folder. That part seems to work, the menu item appears in Sketch. What am I missing?