Migration tool by command line

[mad max]

Hi all,

I'm using mySQL under Windows XP.
I'd like to launch a migration from Access to MySQL by command line.
I made a script with MySQL Migration Toolkit called migration.lua.

then in DOS command, I execute cmd : "grtsh.exe -v -x migration.lua".

I obtain this error message :
"attempt to index global 'Migration' (a nil value)'

Have you got an idea about this issue

Many thanks in advance for your help.