I changed them on this line:
<input type="hidden" name="x_fp_timestamp" id="x_fp_timestamp" value="<?php $WACalculatedHash = WA_CalculateHash("updated login id", "updated transaction code", "".$eCart1->GrandTotal() ."", "".AuthNet_RandomID() ."", "USD")?><?php echo $WACalculatedHash[1]; ?>" />
But still get the error code. Am I missing something?