How to resolve conflict between the mootools.js and crystalreports allInOne.js

I am using vs 2015 and crystal reports 2015 in an asp application and facing a conflict between the below script included in header.inc <script type='text/javascript' src='javascript/mootools.js'></script>

and the script included in the aspx page to view crystal reports as below <script type='text/javascript' src='crystalreportviewers13/js/crviewer/crv.js'></script>

Error: http://localhost:4787/crystalreportviewers13/allInOne.js 0x800a01b6 - JavaScript runtime error: Object doesn't support property or method 'getHTML'