can not run torbrowser sandbox

every time I try to run torbrowser sandbox in macOS 10.12.4 Beta (16E144f) I get the error below. I followed all the directions in the readme file, and still gives me the same error. torbrowser 7.0a1 Referenced from: /Users/'my username removed'/Desktop/tor beta/Sandboxed Tor Browser/TorBrowser.app/./Contents/MacOS/firefox Reason: no suitable image found. Did find: file system sandbox blocked open() of '/usr/lib/libstdc++.6.dylib' file system sandbox blocked open() of '/usr/lib/libstdc++.6.dylib' ./start-browser-with-sandbox: line 24: 3149 Abort trap: 6 sandbox-exec -f "$SB_PROFILE" -D "HOME_DIR=$HOME" -D "CURRENT_DIR=$BASEDIR" -D "TORBROWSER_APP_DIR=$TORBROWSER_APP_DIR" -D "TORBROWSER_DATA_DIR=$TORBROWSER_DATA_DIR" "./Contents/MacOS/firefox"

Trac:
Username: Dbryrtfbcbhgf

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information