webGL create html file that run on firefox but getting an error on unity editor saying unexpected token

Hi, I am able to build unity project in webGL. And it gives me a html and javascript file. The html 5 run properly in firefox. But in unity software, I got a problem fileloader.js, unityConfig.js and webGLbuild.js file saying unexpected token. So I am not able to run that unity project in my PC. But the html file run well in firefox browser. If I remove the WebGL build file from the project, then that unity project doesnot show any error .