diff --git a/dist/index.js b/dist/index.js
index 2f39fc8b..80b952b9 100644
Binary files a/dist/index.js and b/dist/index.js differ
diff --git a/dist/index.js.map b/dist/index.js.map
index 24ccab55..29d28ca3 100644
Binary files a/dist/index.js.map and b/dist/index.js.map differ
diff --git a/src/model/unity-versioning.test.ts b/src/model/unity-versioning.test.ts
index 7a87393a..94aa3c6a 100644
--- a/src/model/unity-versioning.test.ts
+++ b/src/model/unity-versioning.test.ts
@@ -14,8 +14,8 @@ describe('Unity Versioning', () => {
   });
 
   describe('read', () => {
-    it('does not throw', () => {
-      expect(() => UnityVersioning.read('')).not.toThrow();
+    it('throws for invalid path', () => {
+      expect(() => UnityVersioning.read('')).toThrow(Error);
     });
 
     it('reads from test-project', () => {
diff --git a/src/model/unity-versioning.ts b/src/model/unity-versioning.ts
index 7b98e0ab..6bf07081 100644
--- a/src/model/unity-versioning.ts
+++ b/src/model/unity-versioning.ts
@@ -1,4 +1,3 @@
-import * as core from '@actions/core';
 import * as fs from 'fs';
 import path from 'path';
 
@@ -17,8 +16,7 @@ export default class UnityVersioning {
   static read(projectPath) {
     const filePath = path.join(projectPath, 'ProjectSettings', 'ProjectVersion.txt');
     if (!fs.existsSync(filePath)) {
-      core.warning(`Could not find "${filePath}", keeping unityVersion as "auto"`);
-      return 'auto';
+      throw new Error(`Project settings file not found at "${filePath}". Have you correctly set the projectPath?`);
     }
     return UnityVersioning.parse(fs.readFileSync(filePath, 'utf8'));
   }