Unfortunatelly, you are having a conflict in a part of the poject that is not handled by the Modeler.
You have to "manually" resolve the conflict using a SVN tool like svn tortoise https://tortoisesvn.net/downloads.html.
Install the tool and make sure to keep the explorer context menu check box checked, and then you should be able to resolve conflicts by right clicking inside your project (in the windows explorer) and clicking on svn tortoise -> resolve conflict. If you get stuck try googling, you can find a lot of information online regarding tortoise and svn as they are heavily used.
Hope this helps,