diff --git a/http/handler.go b/http/handler.go
index 3226eee50..5b79deef6 100644
--- a/http/handler.go
+++ b/http/handler.go
@@ -347,7 +347,7 @@ func (r *successResponse) check(err error) (statusCode int) {
 	}
 
 	r.Success = false
-	r.Error = &Error{Message: cause.Error()}
+	r.Error = &Error{Message: err.Error()}
 
 	return statusCode
 }
diff --git a/index.go b/index.go
index e94692288..da749ff2d 100644
--- a/index.go
+++ b/index.go
@@ -155,7 +155,7 @@ func (i *Index) openFields() error {
 
 		fld, err := i.newField(i.fieldPath(filepath.Base(fi.Name())), filepath.Base(fi.Name()))
 		if err != nil {
-			return ErrName
+			return errors.Wrapf(ErrName, "'%s'", fi.Name())
 		}
 		if err := fld.Open(); err != nil {
 			return fmt.Errorf("open field: name=%s, err=%s", fld.Name(), err)
diff --git a/pilosa.go b/pilosa.go
index f8989e9b7..d410e1fd4 100644
--- a/pilosa.go
+++ b/pilosa.go
@@ -16,8 +16,9 @@ package pilosa
 
 import (
 	"encoding/json"
-	"errors"
 	"regexp"
+
+	"github.com/pkg/errors"
 )
 
 // System errors.
@@ -152,7 +153,7 @@ const TimeFormat = "2006-01-02T15:04"
 // validateName ensures that the name is a valid format.
 func validateName(name string) error {
 	if !nameRegexp.Match([]byte(name)) {
-		return ErrName
+		return errors.Wrapf(ErrName, "'%s'", name)
 	}
 	return nil
 }
diff --git a/server/handler_test.go b/server/handler_test.go
index d6c5e49ae..ff9654933 100644
--- a/server/handler_test.go
+++ b/server/handler_test.go
@@ -690,9 +690,9 @@ func TestHandler_Endpoints(t *testing.T) {
 		r = test.MustNewHTTPRequest("POST", "/index/idx1", strings.NewReader(""))
 		h.ServeHTTP(w, r)
 		if w.Code != gohttp.StatusConflict {
-			t.Fatalf("unexpected status code: %d", w.Code)
-		} else if w.Body.String() != `{"success":false,"error":{"message":"index already exists"}}`+"\n" {
-			t.Fatalf("unexpected body: %q", w.Body.String())
+			t.Errorf("unexpected status code: %d", w.Code)
+		} else if w.Body.String() != `{"success":false,"error":{"message":"creating index: index already exists"}}`+"\n" {
+			t.Errorf("unexpected body: %q", w.Body.String())
 		}
 
 		// create field
@@ -710,9 +710,9 @@ func TestHandler_Endpoints(t *testing.T) {
 		r = test.MustNewHTTPRequest("POST", "/index/idx1/field/fld1", strings.NewReader(""))
 		h.ServeHTTP(w, r)
 		if w.Code != gohttp.StatusConflict {
-			t.Fatalf("unexpected status code: %d", w.Code)
-		} else if w.Body.String() != `{"success":false,"error":{"message":"field already exists"}}`+"\n" {
-			t.Fatalf("unexpected body: %q", w.Body.String())
+			t.Errorf("unexpected status code: %d", w.Code)
+		} else if w.Body.String() != `{"success":false,"error":{"message":"creating field: field already exists"}}`+"\n" {
+			t.Errorf("unexpected body: %q", w.Body.String())
 		}
 
 		// delete field
@@ -730,9 +730,9 @@ func TestHandler_Endpoints(t *testing.T) {
 		r = test.MustNewHTTPRequest("DELETE", "/index/idx1/field/fld1", strings.NewReader(""))
 		h.ServeHTTP(w, r)
 		if w.Code != gohttp.StatusNotFound {
-			t.Fatalf("unexpected status code: %d", w.Code)
-		} else if w.Body.String() != `{"success":false,"error":{"message":"field not found"}}`+"\n" {
-			t.Fatalf("unexpected body: %q", w.Body.String())
+			t.Errorf("unexpected status code: %d", w.Code)
+		} else if w.Body.String() != `{"success":false,"error":{"message":"deleting field: field not found"}}`+"\n" {
+			t.Errorf("unexpected body: %q", w.Body.String())
 		}
 
 		// delete index
@@ -750,9 +750,9 @@ func TestHandler_Endpoints(t *testing.T) {
 		r = test.MustNewHTTPRequest("DELETE", "/index/idx1", strings.NewReader(""))
 		h.ServeHTTP(w, r)
 		if w.Code != gohttp.StatusNotFound {
-			t.Fatalf("unexpected status code: %d", w.Code)
-		} else if w.Body.String() != `{"success":false,"error":{"message":"index not found"}}`+"\n" {
-			t.Fatalf("unexpected body: %q", w.Body.String())
+			t.Errorf("unexpected status code: %d", w.Code)
+		} else if w.Body.String() != `{"success":false,"error":{"message":"deleting index: index not found"}}`+"\n" {
+			t.Errorf("unexpected body: %q", w.Body.String())
 		}
 	})