Migrate cake 1.3 to 2.9

I am new in cakephp.I try to migrate cakephp 1.3 to 2.9 and face issue.
I only replace cake 1.3 app file to new cake2.9 and getting error.
“fatal Error: Call to a member function event() on null Ajax Helper.php”
Please help

There is WAY more to do in such an upgrade than just replacing some files. You should read up on the upgrade tools, look at the migration guides, and consider upgrading to the 3.x line (4.0 is getting close to release) instead of 2.x.

You need to start on the migration guide (https://book.cakephp.org/2.0/en/appendices.html) and upgrade each step at a time starting with 1.3 to 2.0 (https://book.cakephp.org/2.0/en/appendices/2-0-migration-guide.html)