[OJS and QuickSubmit] Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 1267 Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT)

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PS: this is my configuration.

database
driver 	mysqli
host 	localhost
username 	
password 	
name 	
collation 	utf8_general_ci
debug 	
cache
object_cache 	none
memcache_hostname 	localhost
memcache_port 	11211
web_cache 	
web_cache_hours 	1
i18n
locale 	en_US
client_charset 	utf-8
connection_charset 	utf8