Help! What are the typical diagnosis that one can do when facing "fail to
converge"?

Could anybody please shed some lights on us, besides increasing the number
of iteration limit?

2012-05-10 09:28:45 :  WARNING: lme fit failed with  Error in lme(MyForm,
data = tmp, weights = MyCovStruct, random = MyRndStruct): nlminb problem,
convergence error code = 1
  message = iteration limit reached without convergence (10)

Thank you so much!

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