improve the readability for multiple errors

api/internal/target/kusttarget.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"strings"
 
+	"github.com/hashicorp/go-multierror"
 	"github.com/pkg/errors"
 	"sigs.k8s.io/kustomize/api/builtins"
 	"sigs.k8s.io/kustomize/api/ifc"
@@ -313,12 +314,18 @@ func (kt *KustTarget) accumulateResources(
 		if errF := kt.accumulateFile(ra, path); errF != nil {
 			ldr, errL := kt.ldr.New(path)
 			if errL != nil {
-				return nil, fmt.Errorf("accumulateFile %q, loader.New %q", errF, errL)
+				return nil, multierror.Append(
+					fmt.Errorf("accumulateFile error: %q", errF),
+					fmt.Errorf("loader.New error: %q", errL),
+				)
 			}
 			var errD error
 			ra, errD = kt.accumulateDirectory(ra, ldr, false)
 			if errD != nil {
-				return nil, fmt.Errorf("accumulateFile %q, accumulateDirector: %q", errF, errD)
+				return nil, multierror.Append(
+					fmt.Errorf("accumulateFile error: %q", errF),
+					fmt.Errorf("accumulateDirector error: %q", errD),
+				)
 			}
 		}
 	}