# The requested feature is not implemented

**URL:** <https://www.ruby-forum.com/t/the-requested-feature-is-not-implemented/214919>\
**Category:** IronRuby\
**Created:** [December 15, 2011, 8:22pm UTC](https://www.ruby-forum.com/t/the-requested-feature-is-not-implemented/214919 "2011-12-15T20:22:40Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![dubstep](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/cdc98d/32.png) [@dubstep](https://www.ruby-forum.com/u/dubstep)\
**Post date:** [December 15, 2011, 8:22pm UTC](https://www.ruby-forum.com/t/the-requested-feature-is-not-implemented/214919/1 "2011-12-15T20:22:40Z")

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Hello all,

Why might I get the error “The requested feature is not implemented”  
when  
calling load\_assembly() to load in a Mono-compiled DLL under Ubuntu?  
When I  
use the same script to require the same binary under Windows it works  
fine.

Thanks,  
Rob

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**Author:** ![robtotheb](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/db5fbb/32.png) [@robtotheb](https://www.ruby-forum.com/u/robtotheb)\
**Post date:** [December 15, 2011, 9:22pm UTC](https://www.ruby-forum.com/t/the-requested-feature-is-not-implemented/214919/2 "2011-12-15T21:22:08Z")

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When you say it works on Windows, do you mean Mono on Windows, or  
.NET? I suspect the same thing happens on Mono on Windows, making it a  
Mono bug. And does the same thing happen if you build the assembly in  
Windows? And for what it’s worth, that error message does not occur  
anywhere in IronRuby.

~Jimmy

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**Author:** ![robtotheb](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/db5fbb/32.png) [@robtotheb](https://www.ruby-forum.com/u/robtotheb)\
**Post date:** [December 15, 2011, 10:15pm UTC](https://www.ruby-forum.com/t/the-requested-feature-is-not-implemented/214919/3 "2011-12-15T22:15:17Z")

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I haven’t tried Mono on Windows no, I mean .NET. The C# project when  
compiled with VS or Mono doesn’t make a difference in Windows, it’s just  
on  
Linux that it has the issue.

Yeah you’re right, it’s probably a Mono issue, I’ll send a message over  
to  
them.

Thanks!