Specified key was too long; max key length is 767 bytes

[zascok]

Hi all, trying to update 3 into 4. UTF-8. What do i do?

An error has occurred with your database. 

Module: 400a1, Step 55 Database Error:1071

Specified key was too long; max key length is 767 bytes

Query:

CREATE TABLE stylevar (
				stylevarid varchar(250) NOT NULL,
				styleid SMALLINT NOT NULL DEFAULT '-1',
				value MEDIUMBLOB NOT NULL,
				dateline INT UNSIGNED NOT NULL DEFAULT '0',
				username VARCHAR(100) NOT NULL DEFAULT '',
				UNIQUE KEY stylevarinstance (stylevarid, styleid)
			)