ERROR 1115 (42000): Unknown character set: 'utf8mb4'
Your version does not support that character set, I believe it was 5.5.3 that introduced it. You should upgrade your mysql to the version you used to export this file.
The error is then quite clear: you set a certain character set in your code, but your mysql version does not support it, and therefore does not know about it.
According to https://dev.mysql.com/doc/refman/5.5/en/charset-unicode-utf8mb4.html :
utf8mb4 is a superset of utf8
so maybe there is a chance you can just make it utf8, close your eyes and hope, but that would depend on your data, and I'd not recommend it.
You can try:
Open sql file by text editor find and replace all
utf8mb4 to utf8Import again.
This can help:
mysqldump --compatible=mysql40 -u user -p DB > dumpfile.sqlPHPMyAdmin has the same MySQL compatibility mode in the 'expert' export options. Although that has on occasions done nothing.
If you don't have access via the command line or via PHPMyAdmin then editing the
/*!50003 SET character_set_client = utf8mb4 */ ; bit to read 'utf8' only, is the way to go.