diff --git a/inject.go b/inject.go
index b35b2a1..5bb660f 100644
--- a/inject.go
+++ b/inject.go
@@ -11,13 +11,11 @@ var ProjectRoot string
 
 func init() {
 	if ProjectRoot == "" {
-		fmt.Fprintf(os.Stderr, "ProjectRoot is not set\n")
-		return
+		panic("ProjectRoot is not set, compile with -ldflags '-X github.com/cpunion/go-python.ProjectRoot=/path/to/project/.deps'")
 	}
 	envs, err := env.ReadEnv(ProjectRoot)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "Failed to read env: %s\n", err)
-		return
+		panic(fmt.Sprintf("Failed to read env: %s", err))
 	}
 	for key, value := range envs {
 		os.Setenv(key, value)
diff --git a/internal/env/env.go b/internal/env/env.go
index c9bc188..ab2e7b9 100644
--- a/internal/env/env.go
+++ b/internal/env/env.go
@@ -133,7 +133,7 @@ func ReadEnvFile(projectDir string) (map[string]string, error) {
 	envFile := GetEnvConfigPath(projectDir)
 	content, err := os.ReadFile(envFile)
 	if err != nil {
-		return nil, fmt.Errorf("failed to read env file: %v", err)
+		return nil, fmt.Errorf("failed to read env file %s: %v", envFile, err)
 	}
 	envs := map[string]string{}
 	for _, line := range strings.Split(strings.TrimSpace(string(content)), "\n") {