error in sec index entry update

Hello, I'm using mysql 3.23.40 with InnoDB tables. Recently I've been seeing several of the following messages in my logs related to indexes. InnoDB: error in sec index entry update in InnoDB: index user_ table webassign/roster InnoDB: tuple 0: len 50; hex

[Got error 139 from table handler using InnoDB]

Hi! I'm new to the list so please forgive me if this problem has already been solved. I've been using MySQL for development for sometime. Up until now I've been using MyISAM tables. I've decided to switch to InnoDB because some table files (*.MYD) are approaching the OS limit. I get the above