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Hello just to update on this in case useful for others, it was caused by the number of missing cases for the level 1 and level 2 variables not matching up. Once I dropped missing cases to use a complete case dataset, the problem disappeared. Thanks anyway for the reply. Dan.

Hello I just updated both my machines to the latest version of mlwin, which I have installed so that I can use runmlwin from stata. On one machine, I have 3.01 installed, and on the other it was an older version, 2.x (can't remember which exactly). Now I am getting this error with my models, where I...