Unable to boot simulator in xcode 9.4

I have updated the os to high sierra and after that updated xcode 9.2 to xcode 9.4. But not able to run the project in simulator. When try to run in simulator getting error "Unable to boot the simulator" and in storyboard "Internal error occurred.Editing functionality may be limited." Only layout is visible.


Please let me know how can I solve this.Its urgent.


Thanks in advance.

Unable to boot simulator in xcode 9.4
 
 
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