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Hello, I created a paravirtualized Debian Squeeze guest (using virt-manager), after completing the initial setup I was asked to reboot, in order to finalise the installation. The guest startup breaks down with the error message: Error starting domain: POST operation failed: xend_post: error from xen daemon: (xend.err "Error creating domain: Boot loader didn''t return any

I am trying to calibrate a non linear mixed model with a AR(1) autocorrelation structure. This structure is indicated by the ACF plot. When calibrating the model without the AR(1), everything comes out nicely. However, when the AR(1) structure is included in the model, the Phi parameter estimate comes out to be 1. This result occurs with various starting values in the correlation statement. Am I