# Demo build problems "cannot instantiate abstract class" **URL:** \ **Category:** Meeting SDK\ **Created:** [May 14, 2020, 12:25pm UTC](https://devforum.zoom.us/t/demo-build-problems-cannot-instantiate-abstract-class/17644 "2020-05-14T12:25:54Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![congoblue](https://avatars.discourse-cdn.com/v4/letter/c/ec9cab/32.png) [@congoblue](https://devforum.zoom.us/u/congoblue)\ **Post date:** [May 14, 2020, 12:25pm UTC](https://devforum.zoom.us/t/demo-build-problems-cannot-instantiate-abstract-class/17644/1 "2020-05-14T12:25:54Z")
Hi, having problems getting the Desktop SDK demo to build using Visual Studio Community 2017. This is probably a simple configuration problem in VS but I have so far failed to find the problem. VS 2019 community has the same problem. \zoom-sdk-windows-master\demo\sdk\_demo\demoui.cpp(13): error C2259: ‘CMeetingServiceMgr’: cannot instantiate abstract class Desktop SDK v4.6.21666.0428 Visual Studio Community 2017 (2019 behaves the same) This is using the SDK zip downloaded from the Zoom site, loading /demo/sdk\_demo/sdk\_demo\_2017.sdk, change build to “Release”, platform “x86”, press “Build solution” I am probably missing something really obvious. Hope someone can point it out. ---
**Author:** ![congoblue](https://avatars.discourse-cdn.com/v4/letter/c/ec9cab/32.png) [@congoblue](https://devforum.zoom.us/u/congoblue)\ **Post date:** [May 14, 2020, 2:26pm UTC](https://devforum.zoom.us/t/demo-build-problems-cannot-instantiate-abstract-class/17644/2 "2020-05-14T14:26:03Z")
Sorry to reply to my own topic. But there appears to be a line missing in MeetingServiceMgr.h If I add this line at line 141 in the file then the demo will build successfully virtual void onBreakoutRoomBtnClicked() {} I am not sure if this is a problem with my particular setup of Visual Studio or if I am just the first person to attempt to build this version of the SDK demo. ---
**Author:** ![rodo](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/rodo/32/8553_2.png) [@rodo](https://devforum.zoom.us/u/rodo)\ **Post date:** [May 15, 2020, 5:17pm UTC](https://devforum.zoom.us/t/demo-build-problems-cannot-instantiate-abstract-class/17644/3 "2020-05-15T17:17:39Z")
Cheers man! This fixes me as well. Wasn’t sure if it was because I retargeted to Windows 10 SDK (SLN was set to 8.1… lol) Anyways, ZOOM please fix your demos!! Rodrigo ---
**Author:** ![carson.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/carson.zoom/32/785_2.png) [@carson.zoom](https://devforum.zoom.us/u/carson.zoom)\ **Post date:** [May 15, 2020, 8:13pm UTC](https://devforum.zoom.us/t/demo-build-problems-cannot-instantiate-abstract-class/17644/4 "2020-05-15T20:13:18Z")
Hi [congoblue](https://devforum.zoom.us/u/congoblue), Thanks for using Zoom SDK and glad you found the solution. The sdk\_demo project has been deprecated, and we will remove it in the near future. Please have a try with the sdk\_demo\_v2([https://github.com/zoom/zoom-sdk-windows/tree/master/demo/sdk\_demo\_v2](https://github.com/zoom/zoom-sdk-windows/tree/master/demo/sdk_demo_v2)), it includes everything that is covered in sdk\_demo, and it has more. Please use sdk\_demo\_v2 as the reference for your implementation. Thanks! ---
**Author:** ![carson.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/carson.zoom/32/785_2.png) [@carson.zoom](https://devforum.zoom.us/u/carson.zoom)\ **Post date:** [May 15, 2020, 8:16pm UTC](https://devforum.zoom.us/t/demo-build-problems-cannot-instantiate-abstract-class/17644/5 "2020-05-15T20:16:05Z")
Hi Rodrigo, Thanks for using Zoom SDK and thanks for the feedback. Please have a try with the sdk\_demo\_v2([https://github.com/zoom/zoom-sdk-windows/tree/master/demo/sdk\_demo\_v2](https://github.com/zoom/zoom-sdk-windows/tree/master/demo/sdk_demo_v2)). Thanks! ---
**Author:** ![congoblue](https://avatars.discourse-cdn.com/v4/letter/c/ec9cab/32.png) [@congoblue](https://devforum.zoom.us/u/congoblue)\ **Post date:** [May 16, 2020, 7:55am UTC](https://devforum.zoom.us/t/demo-build-problems-cannot-instantiate-abstract-class/17644/6 "2020-05-16T07:55:13Z")
Hi, I could not get the sdk\_demo\_v2 to build either using Visual Studio 2017 Community. I get many errors relating to missing atlbase.h ---
**Author:** ![carson.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/carson.zoom/32/785_2.png) [@carson.zoom](https://devforum.zoom.us/u/carson.zoom)\ **Post date:** [May 19, 2020, 4:18am UTC](https://devforum.zoom.us/t/demo-build-problems-cannot-instantiate-abstract-class/17644/7 "2020-05-19T04:18:41Z")
Hi [congoblue](https://devforum.zoom.us/u/congoblue), Thanks for the reply. Are you opening the sdk\_demo\_v2 project by opening the sdk\_demo\_v2\_2017.sln file([https://github.com/zoom/zoom-sdk-windows/blob/master/demo/sdk\_demo\_v2/sdk\_demo\_v2\_2017.sln](https://github.com/zoom/zoom-sdk-windows/blob/master/demo/sdk_demo_v2/sdk_demo_v2_2017.sln))? You could follow the instruction in our doc to build and to run our demo app: [https://marketplace.zoom.us/docs/sdk/native-sdks/windows/getting-started/install-sdk](https://marketplace.zoom.us/docs/sdk/native-sdks/windows/getting-started/install-sdk) If the error persists, please let me know. Thanks! ---
**Author:** ![DeveloperBot](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/developerbot/32/12632_2.png) [@DeveloperBot](https://devforum.zoom.us/u/DeveloperBot)\ **Post date:** [August 21, 2020, 9:23pm UTC](https://devforum.zoom.us/t/demo-build-problems-cannot-instantiate-abstract-class/17644/8 "2020-08-21T21:23:35Z")
Closed on August 21, 2020, 9:23pm UTC