imbalance():  3258  <tmp>[1,1] found where void required
                 <istmt>:     -  function returned error
r(3258);

A previous reply to someone who also got this error message said to update cem because there was a bug with the imb function.

I updated and now recieve this message:

NOTE: Treatment has must have only 2 levels to compute distance and weights. In addition, k2k cannot be used.

Does this mean cem cannot be used with more than 2 treatments? Actually I have a continuous treatment but I recoded it to a variable with four levels. 

Thanks!

Erik