Startup error launching my project after upgrading editor

Hi! I got a startup error launching my project after upgrading editor from UE 4.7 Preview 3 to UE 4.7 Preview 4. It doesen’t display the error type just “Apologize for the inconvenience”. How can I fix it?

Hi marciusB,

Does your project have any foliage in it? Additionally, does the startup failure produce any logs?

Yes there are grass and trees as a foliage.Trees from speedtree and grass from marketplace compatible with 4.5 - 4.6. Could it be caused by grass?

Hi MarciusB,

There is a known issue with preview 4 in which foliage and instanced meshes are causing immediate crashes in the editor. unfortunately for now it would be best to revert to 4.6.1 if you wish to use foliage in the editor until this error has been properly fixed.