xaf 打开Model.xafml报错， Value cannot be null. (Parameter 'uriString')

xaf .win项目，Model.xafml 文件打开时报错，设计器不能正确加载

Analyze the ModelEditorServerNETCore and ModelEditorClientNETCore log files in the %USERPROFILE%\AppData\Roaming\eXpressAppFramework\ folder OR send the archived folder to DevExpress Support.

For more information on how to collect this diagnostic information, refer to https://www.devexpress.com/go/XAF_ModelEditor_Troubleshooting.aspx

 Value cannot be null. (Parameter 'uriString')

 

经常分析，得出原因可能是服务端url变量没有指定默认值，传入的变量是运行时获取的

如下：

 

 果不其然，指定默认值后，重新编译项目，成功打开