public static void Initialize( string licenseKey = null, string specificPath = null, string icuSpecificPath = null )
You have to call this function before you can call any PDF processing functions.
In some cases, library initializer can not find pdfim/icudt dynamic library (.dll/.dylib) library to load. A typical example of this situation is a Web application. Web apps is running in a IIS working directory, unlike the classical apps. As a consequence, standard LoadLibrary function can not find the dll during loading process.
In this case, you must explicitly specify the full path to the dll files through specificPath parameters in the initialization method.