# Error "undefined method is\_haml?" (custom form builder)

**URL:** <https://www.ruby-forum.com/t/error-undefined-method-is-haml-custom-form-builder/129370>\
**Category:** Rails\
**Created:** [February 17, 2008, 9:01pm UTC](https://www.ruby-forum.com/t/error-undefined-method-is-haml-custom-form-builder/129370 "2008-02-17T21:01:49Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![josh](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/45deac/32.png) [@josh](https://www.ruby-forum.com/u/josh)\
**Post date:** [February 17, 2008, 9:01pm UTC](https://www.ruby-forum.com/t/error-undefined-method-is-haml-custom-form-builder/129370/1 "2008-02-17T21:01:49Z")

</div>

Hi all

I’m experimenting with HAML. Sadly I’m getting an error on a page that  
doesn’t have anything to do with HAML (it’s a normal rhtml template)!

undefined method `is\_haml?’ for #IncenseFormBuilder:0x31b0e88

It’s a custom form builder I have built, and I have no idea were this  
is\_haml? comes from…

Any idea? Thanks a lot.  
Josh