# Demo Issue

**URL:** <https://forum.juce.com/t/demo-issue/12360>\
**Category:** General JUCE discussion\
**Created:** [February 11, 2014, 5:29pm UTC](https://forum.juce.com/t/demo-issue/12360 "2014-02-11T17:29:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Shlomi](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/shlomi/32/99_2.png) [@Shlomi](https://forum.juce.com/u/Shlomi)\
**Post date:** [February 11, 2014, 5:29pm UTC](https://forum.juce.com/t/demo-issue/12360/1 "2014-02-11T17:29:57Z")

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Hi Jules

I get this error message when building the demo from the tip in Windows:

&nbsp;

> Error&nbsp;&nbsp; &nbsp;1&nbsp;&nbsp; &nbsp;error C2259: 'MidiDemo' : cannot instantiate abstract class&nbsp;&nbsp; &nbsp;c:\juce\extras\demo\source\jucedemoheader.h&nbsp;&nbsp; &nbsp;65  
> &nbsp;

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<div class="post-metadata">

**Author:** ![Shlomi](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/shlomi/32/99_2.png) [@Shlomi](https://forum.juce.com/u/Shlomi)\
**Post date:** [February 11, 2014, 5:54pm UTC](https://forum.juce.com/t/demo-issue/12360/2 "2014-02-11T17:54:46Z")

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My bad, it was a bug in my code, sorry.