diff --git a/internal/version/VERSION b/internal/version/VERSION
index 49601f28..9e536156 100644
--- a/internal/version/VERSION
+++ b/internal/version/VERSION
@@ -1 +1 @@
-v5.0.0+2503051811
+v5.0.0-beta-2503051939
diff --git a/plugin.go b/plugin.go
index 30875888..6baaac7a 100644
--- a/plugin.go
+++ b/plugin.go
@@ -37,12 +37,12 @@ func initPlugin(path, venv string, logOn bool) (plugin funplugin.IPlugin, err er
 		Bool("logOn", logOn).Msg("init plugin")
 	// plugin file not found
 	if path == "" {
-		return nil, nil
+		return nil, errors.New("testcase path not specified")
 	}
 	pluginPath, err := LocatePlugin(path)
 	if err != nil {
 		log.Warn().Str("path", path).Msg("locate plugin failed")
-		return nil, nil
+		return nil, errors.Wrap(err, "locate plugin failed")
 	}
 
 	pluginMutex.Lock()
diff --git a/tests/runner_test.go b/tests/runner_test.go
index c246f076..e4745a5b 100644
--- a/tests/runner_test.go
+++ b/tests/runner_test.go
@@ -63,7 +63,8 @@ func assertRunTestCases(t *testing.T) {
 	refCase := hrp.TestCasePath(demoTestCaseWithPluginJSONPath)
 	testcase1 := &hrp.TestCase{
 		Config: hrp.NewConfig("TestCase1").
-			SetBaseURL("https://postman-echo.com"),
+			SetBaseURL("https://postman-echo.com").
+			EnablePlugin(), // TODO: FIXME
 		TestSteps: []hrp.IStep{
 			hrp.NewStep("testcase1-step1").
 				GET("/headers").
@@ -219,6 +220,7 @@ func TestRunCaseWithPluginJSON(t *testing.T) {
 	defer removeHashicorpGoPlugin()
 
 	testCase := hrp.TestCasePath(demoTestCaseWithPluginJSONPath)
+	// TODO: FIXME, enable plugin
 	err := hrp.NewRunner(nil).Run(&testCase) // hrp.Run(testCase)
 	if err != nil {
 		t.Fatal()