Fix module importer error msg & test

compose/importer/module.go

@@ -296,7 +296,7 @@ func (mImp *Module) resolveRefs(module *types.Module) (uint, error) {
 				}
 
 				if refmod, err := mImp.Get(refHandle); err != nil || refmod == nil {
-					return errors.Errorf("could not load module %q on module %q, field %q options, err: %v)",
+					return errors.Errorf("could not load module %q on module %q, field %q options (err: %v)",
 						refHandle, module.Handle, field.Name, err)
 				} else {
 					refs++

compose/importer/module_test.go

@@ -104,7 +104,7 @@ func TestModuleImport_CastSet(t *testing.T) {
 				_, err = module.resolveRefs(m)
 				return err
 			}),
-			`could not load module "modFoo" for page "modA" block #1 (err: <nil>)`)
+			`could not load module "modFoo" on module "modA", field "ref2" options (err: <nil>)`)
 
 	})
 }