I have implemented 25 rows and 3 columns in by using structure table in one of the class.
I got this error while saving class and in rebuild.
In PDOConnection.php line 78:
SQLSTATE: Syntax error or access violation: 1118 Row size too large. The maximum row size for the used table type, not counting BLOBs, is 65535. This includes storage overhead, check the manual
l. You have to change some columns to TEXT or BLOBs