Refactor the build-task

gulpfile.ts

@@ -193,6 +193,9 @@ function BrowserSync(filePath?: string): TaskFunction
  * Builds the project.
  */
 export async function Build(): Promise<void>
+{
+    return new Promise(
+        (resolve, reject) =>
         {
             if (settings.Watch)
             {
@@ -213,12 +216,19 @@ export async function Build(): Promise<void>
                 gulp.watch(settings.TemplateSource("**"), { usePolling: true }, gulp.series(Templates, BrowserSync()));
             }
 
-    await Promise.all(
-        [
-            Library(),
-            Theme(),
-            Templates()
-        ]);
+            gulp.parallel(Library, Theme, Templates)(
+                (error) =>
+                {
+                    if (error)
+                    {
+                        reject(error);
+                    }
+                    else
+                    {
+                        resolve();
+                    }
+                });
+        });
 }
 
 /**