Hummingbird gives an error 500 on my multisite

I downloaded Hummingbird and activated it on my multisite. After I enable Hummingbird All my sites go down and I get 500 error.

I try plugin conflict - no result
.htaccess file is fine
Server does not generate debug.log or error_log

My settings:
max_execution_time 300
memory_limit 1280
upload_max_filesize 1000
post_max_size 1000