android不能显示log的问题

android不能显示log的问题，提示 Unable to open log device '/dev/log/main': No such file or directory。

Solution: 

On call screen type *#*#2846579#*#* 

opens system management menu 

Project menu -> background settings -> Log setting 

Log level setting -> VERBOSE Log switch -> LOG on 

Dump and Log -> Checked all the boxes 

Restart device.