Ok, what you are not understanding, is the server path quoted in the "error" is not the server path to that file/folder. I have NO capital letters in my install path AT ALL, and my install directory IS NOT "AbanteCart".
So, the file call that is looking for something in a directory named "AbanteCart" is not going to find it, because that directory does not exist on the server. It is a program error, therefore. The host provider certainly didn't write the string of code!