tryin to get error message to display

can someone help trying to get code to display error message >

getting error message
Undefined index: error in C:\wamp\www\newland\tourprice.php on line 54

line 54 reads
if ($_GET[‘error’] == “notnumeric”)

It means that php is seeing that variable before its being filled. 3 ways to fix it, 1 suppress the error message or 2, use isset() in the if statement, or 3, fill the variable before using it.

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