I appears that the column 'help' is missing in the block table in your mySQL database. I traced the variable and noticed it was inserted into table 'blocks', column 'help'. So in order to fix the problem, add a column:
field: help, type: varchar(96), Null: yes
WARNING: this is *my* solution, I haven't thoroughly tested it, so if you want to make sure nothing goes wrong, wait until one of the developers has confirmed.