xtoverid error: internal reestimation of eqn differs from original?

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xtoverid error: internal reestimation of eqn differs from original?

Qian Yu
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Dear all
     After I run the command "xtoverid2, noi robust" or "xtoverid, noi" after random effect panel regression "xrivreg, re", the end of the estimation showed that "xtoverid error: internal reestimation of eqn differs from original", what's the meaning of this diagnostic error?

Many thanks,
Qian