Update error messages (#1291)

Author: deliahu

pkg/types/clusterconfig/errors.go

@@ -150,7 +150,7 @@ func ErrorOnDemandBaseCapacityGreaterThanMax(onDemandBaseCapacity int64, max int
 func ErrorConfigCannotBeChangedOnUpdate(configKey string, prevVal interface{}) error {
 	return errors.WithStack(&errors.Error{
 		Kind:    ErrConfigCannotBeChangedOnUpdate,
-		Message: fmt.Sprintf("modifying %s in a running cluster is not supported, please set %s to its previous value: %s", configKey, configKey, s.UserStr(prevVal)),
+		Message: fmt.Sprintf("modifying %s in a running cluster is not supported, please set %s to its previous value (%s)", configKey, configKey, s.UserStr(prevVal)),
 	})
 }
 
@@ -246,6 +246,6 @@ func ErrorCantOverrideDefaultTag() error {
 func ErrorSSLCertificateARNNotFound(sslCertificateARN string, region string) error {
 	return errors.WithStack(&errors.Error{
 		Kind:    ErrSSLCertificateARNNotFound,
-		Message: fmt.Sprintf("unable to find the specified ssl certificate in region %s: %s", region, sslCertificateARN),
+		Message: fmt.Sprintf("unable to find the specified ssl certificate in %s: %s", region, sslCertificateARN),
 	})
 }

pkg/types/spec/errors.go

@@ -267,7 +267,7 @@ func ErrorInvalidTensorFlowModelPath() error {
 func ErrorMissingModel(predictorType userconfig.PredictorType) error {
 	return errors.WithStack(&errors.Error{
 		Kind:    ErrMissingModel,
-		Message: fmt.Sprintf("at least one model must be specified for %s predictor type; use fields %s:%s or %s:%s to add model(s)", predictorType, userconfig.PredictorKey, userconfig.ModelPathKey, userconfig.PredictorKey, userconfig.ModelsKey),
+		Message: fmt.Sprintf("at least one model must be specified for the %s predictor type; use fields %s.%s or %s.%s to add model(s)", predictorType, userconfig.PredictorKey, userconfig.ModelPathKey, userconfig.PredictorKey, userconfig.ModelsKey),
 	})
 }