Start the application called 'Console' before starting Toribash (it's in Applications > Utilities > Console)
and click on the 'clean' button.
and then try loading one of the mods.
Post here the error messages that appear in the console window
It seems it cannot find the mod or open the mod file.
Make sure that you save the mod to the right location, that the file's permissions for reading are allowed and that the file name letters case matches the one in the replay (the one in the replay is the one that appears in 'unable to load mod'.