when i run unity game it shows webgl error even i am not in webgl project unity code example

Example 1: modify web page from unity from code

<script type="text/javascript" language="javascript">
<!--
function SayHello( arg )
{
    // show the message
    alert( arg );
}
-->
</script>

Example 2: modify web page from unity from code

Application.ExternalCall( "SayHello", "The game says hello!" );