HelpYogda not recognizing swf file when editing it

Can someone help me it would be really appreciated.
I am using the fabiano-swagger-of-doom source and I wanted to edit it in Yogda so I could make it online
It gives me an error Not an SWF file no header
Thanks

I'm also having this error

if your using the defaut fsod client, you won't be able to edit it with yodga, Use Rasdasm. If your using the AS3 client, use intelliJ

I believe this is solved?

Just thought I'd throw in some info. I use Rabcdasm and Astrogrepp. They work perfectly together!