diff --git a/src/Encore.php b/src/Encore.php
index b2243d4..a65f1b0 100644
--- a/src/Encore.php
+++ b/src/Encore.php
@@ -136,7 +136,12 @@ public function getAssets(string $name, string $entryPoint, array $config): arra
 
         $entrypoints = $this->getEntrypoint($name);
         if (!isset($entrypoints['entrypoints'][$entryPoint])) {
-            throw new \LogicException('No entry point found in the entrypoint.js');
+            throw new \LogicException(
+                'EntryPoint: ' . $entryPoint . ' not found in entrypoint.json. ' . \PHP_EOL .
+                'Available entry points are: ' . implode(', ', array_keys(
+                    $entrypoints['entrypoints']
+                ))
+            );
         }
 
         $enqueue = $entrypoints['entrypoints'][$entryPoint];
@@ -222,7 +227,7 @@ public function getEntrypoint(string $dir): array
             return $this->entryPointCache[$this->outputPath][$dir];
         }
 
-        $filepath = $this->rootPath . '/entrypoints.json';
+        $filepath = trailingslashit($this->rootPath) . 'entrypoints.json';
 
         if (!file_exists($filepath)) {
             throw new \LogicException(sprintf('Entrypoint %s does not exist.', $filepath));