When using PHP on windows the temptation is to use windows path format when one is trying to include or require a file. If you decide to do so, you must escape the all backslashes
for example:
$path= 'c:\ycsoftware\library\' will not work on windows.
solution
change it to
$path ='c:/ycsoftware/library/';
or
escape all backslashes with double backslashes
$path='c:\\ycsoftware\\library\\';