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14 Error messages 232Alphabetical list of error messages and probable cause(s)/remedieserror messageprobable cause/remedyContinue from .rsv fileConvergence failedCorrelation structure is notpositive definiteDefine structure for ...Error in !CONTRAST label factorvaluesError in !SUBSET label factorvaluesError in R structure:checksError opening fileError reading somethingmodelTry running without the !CONTINUE qualifier.the program did not proceed to convergencebecause the REML log-likelihood was fluctuatingwildly. One possible reason is that somesingular terms in the model are not being detectedconsistently. Otherwise, the updated Gstructures are not positive definite. There aresome things to try:– define US structures as positive definite byusing !GP,– supply better starting values,– fix parameters that you are confident ofwhile getting better estimates for others(that is, fix variances when estimating covariances),– fit a simpler model,– reorganise the model to reduce covarianceterms (for example, use CORUH instead ofUS.)It is best to start with a positive definite correlationstructure. Maybe use a structured correlationmatrix.A variance structure should be specified forthis term.The error could be in the variable(factor)name or in the number of values or the listof values.The error could be in the variable(factor)name or in the number of values or the listof values.the error model is not correctly specified.the file did not exist or was of the wrong filetype (binary = unformatted, sequential).There are several messages of this form wheresomething is what ASReml is attempting toread. Either there is an error telling ASRemlto read something when it does not need to,or there is an error in the way something isspecified.