Celina
I suspect you are not installing the files as directed.
You say you put all of the code into Plugins - that's NOT what you do.
You extract the files from the zip and files that come zipped in subfolders stay in those subfolders in side Plugins only the files located directly within the zip go into Plugins.
You have reported similar problems on another thread and I have given more detail in my rely there... http://forums.sketchucation.com/viewtopic.php?p=335834#p335834