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14 Error messages 238Alphabetical list of error messages and probable cause(s)/remedieserror messageprobable cause/remedyReading distances for POWERstructureReading factor names:reading Overdispersion factorREADING OWN structures ...Reading the data:Reading Update step size:Residual Variance is Zero:R header SECTIONS DIMNS GSTRUCTR structure header SITE DIMGSTRUCTVariance header: SEC DIM GSTRUCTR structure error ORDER SORTCOLMODEL GAMMAS:R structures are larger thannumber of recordsREQUIRE !ASUV qualifier for thisR structureREQUIRE I x E R structurePOWER structures are the spatial variancemodels which require a list of distances. Distancesshould be in increasing order. If thedistances are not obtained from variables, the’SORT’ field is zero and the distances are presentedafter all the R and G structures aredefined.something is wrong in the terms definitions. Itcould also be that the data file is misnamed.Check the argument.There is probably a problem with the outputfrom MYOWNGDG. Check the files, includingthe time stamps to check the .gdg file is beingformed properly.if you read less data than you expect, thereare two likely explanations. First, the datafile has less fields than implied by the datastructure definitions (you will probably readhalf the expected number). Second, there isan alphanumeric field where a numeric field isexpected.check the !STEP qualifier argument.either all data is deleted or the model fully fitsthe data.error with the variance header line. Often,some other error has meant that the wrongline is being interpreted as the variance headerline. Commonly, the model is written over severallines but the incomplete lines do not allend with a comma.an error reading the error model.Maybe you need to include mv in the model tostop ASReml discarding records with missingvalues in the response variable.Without the ASUV qualifier, the multivariateerror variance MUST be specified as US.