Failed to initiate service connection to simulator Connection timed out.

Hi,

,I have problem with connection to simulator when use Xcode,it's waring "Failed to initiate service connection to simulatorDTServiceHubClient failed to bless service hub for simulator iPhone 7 Plus (EAD91688-B8F3-4DA9-B845-F0FD5E6A494C)",

Anyone help me,thanks very much!

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Today, I used the Terminal to execute the following commands:


cd /var

chmod -R 755 *


Is this the cause of the problem,And What I should do?

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lslboyhh
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