Store stopped working suddenly version 3.0.2

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Notice: Undefined variable: _REQUEST in /.../system/library/request.php on line 26 Warning: Cannot modify header information - headers already sent by (output started at /.../system/framework.php:42) in /.../system/framework.php on line 108 Warning: Cannot modify header information - headers already sent by (output started at /.../system/framework.php:42) in /.../catalog/controller/startup/session.php on line 25

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SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data
OK
<b>Notice</b>: Undefined variable: _REQUEST in <b>/.../system/library/request.php</b> on line <b>26</b><b>Warning</b>: Cannot modify header information - headers already sent by (output started at /.../system/framework.php:42) in <b>/.../system/framework.php</b> on line <b>108</b><b>Warning</b>: Cannot modify header information - headers already sent by (output started at /.../system/framework.php:42) in <b>/.../catalog/controller/startup/session.php</b> on line <b>25</b>{"success":"Success: You have added <a href=\"http:\/\/mydomain.com\/index.php?route=product\/product&amp;product_id=51\">Antietam 2017 Longsleeve T-Shirt<\/a> to your <a href=\"http:\/\/mydomain.com\/index.php?route=checkout\/cart\">shopping cart<\/a>!","total":"1 item(s) - $15.79"}

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if ($config->get('error_display')) {
           //echo '<b>' . $error . '</b>: ' . $message . ' in <b>' . $file . '</b> on line <b>' . $line . '</b>';
}