I am fetching some problem after on live server How to solve

Yii 2.0
1

Fatal error : Uncaught yii\web\HeadersAlreadySentException: Headers already sent in /home/u425439919/domains/indiatutor.org/public_html/vendor/yiisoft/yii2/web/Response.php on line 437. in /home/u425439919/domains/indiatutor.org/public_html/vendor/yiisoft/yii2/web/Response.php:373 Stack trace: #0 /home/u425439919/domains/indiatutor.org/public_html/vendor/yiisoft/yii2/web/Response.php(346): yii\web\Response->sendHeaders() #1 /home/u425439919/domains/indiatutor.org/public_html/vendor/yiisoft/yii2/web/ErrorHandler.php(136): yii\web\Response->send() #2 /home/u425439919/domains/indiatutor.org/public_html/vendor/yiisoft/yii2/base/ErrorHandler.php(288): yii\web\ErrorHandler->renderException(Object(yii\base\ErrorException)) #3 [internal function]: yii\base\ErrorHandler->handleFatalError() #4 {main} thrown in /home/u425439919/domains/indiatutor.org/public_html/vendor/yiisoft/yii2/web/Response.php on line 373

2

Likely you have stray echo somewhere.

3

Or, it might be a problem in source code encoding. I think it could happen when the development environment is Windows and the live server is unix. Make sure all your files are encoded in UTF-8 w/o BOM.