An error occurred while loading the project. The ip address set for the local Web Server preview is incorrect 
Author: Nikos V.
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Hello i have the same problem using X5 professional 15. Projects can be open with other versions. But i need to open the projects with 15. I tried to edit (and delete) the config file but didnt work. Please let me know about possible solution. Thank you very much
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Hi Nikos,
I moved your message here, so to offer you better assistance.
You can temporarily solve this issue by deleting the config.xml file or modifying it as follows:
<IPAddress> 127.0.0.1 </ IPAddress>
<PortNumber> 8080 </ PortNumber>
You can find config.xml here C: \ Users \ Your name Windows user \ AppData \ Local \ Incomedia \ WebSite X5 v15 - Professional.
However, the matter was sent to the developers and I will keep you informed in case of news.
Thank you, have a nice day.