A PHP Error was encountered

Severity: Notice

Message: Only variable references should be returned by reference

Filename: core/Common.php

Line Number: 257

IPEC Pipeline Toolbox | <div style="border:1px solid #990000;padding-left:20px;margin:0 0 10px 0;"> <h4>A PHP Error was encountered</h4> <p>Severity: Notice</p> <p>Message: Undefined variable: formula</p> <p>Filename: views/header2.php</p> <p>Line Number: 8</p> </div>