The trial package is returning a 'license not valid' exception. The trial package can run on localhost and private networks for testing purposes; and you are using it on a server with a public IP.
To solve this common mistake, we have uploaded a new version of the trial package without the IP restriction. Please download again the trial package on https://www.phpdocx.com/download_trial. This new package adds the watermark background, phpdocx custom properties and the trial messages, but it doesn't control if you are using the trial on a private or public server; all watermarks about phpdocx trial are removed using a purchased license.