mxData error details

regarding this query...
http://openmx.psyc.virginia.edu/thread/589
and this error
Error: The data object 'MZ.data' contains an observed matrix that is not of type 'double'

it would be very helpful to add a call to summary Names and say something like

Error: The data object 'MZ.data' contains an observed matrix that is not of type 'double'
details:
type(MZ.data) is that is fine|I am expecting a matrix or dataframe
MZ.data contains 2 variables as follows:
twin1: type logical
twin2: type integer
I am expecting a matrix consisting of type double. You might try MZ.data=as.double(MZ.data)

No idea what was causing this issue or how to verify its existence or non-existence. If it's still a problem, post a new issue with how to generate the error and what the preferred behavior is.