# No such class error \[offtopic - working with the App Inventor sources\] **URL:** \ **Category:** Off Topic\ **Tags:** offtopic\ **Created:** [August 2, 2017, 3:13pm UTC](https://community.thunkable.com/t/no-such-class-error-offtopic-working-with-the-app-inventor-sources/6046 "2017-08-02T15:13:58Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Red\_Panda](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/red_panda/32/19387_2.png) [@Red\_Panda](https://community.thunkable.com/u/Red_Panda)\ **Post date:** [August 2, 2017, 3:13pm UTC](https://community.thunkable.com/t/no-such-class-error-offtopic-working-with-the-app-inventor-sources/6046/1 "2017-08-02T15:13:58Z")
Hi guys, I have been struggling with my [Wolfram|Alpha extension](http://community.thunkable.com/t/extension-for-wolfram-alpha-beta/5081) for so long and I don’t know where to start. As you may know, I am new to extension developing and the Wolfram|Alpha extension is my second extension. First, I couldn’t even import my extension, but that has been solved with the new blockly version. Long text, short problem: When I start Thunkable live, I get the following error > Error from Thunkable Live: java.lang.RuntimeException: invalid syntax in eval form: > :1:929: caught exception in inliner for # - java.lang.RuntimeException: no such class: com.redpanda.wolframAlpha.WolframAlpha Your help is appreciated. Greetings, @Red_Panda PS: I saw [this](http://community.thunkable.com/t/bluetoothle-no-such-class-in-live-development-only/2293/17) post and it seems to be the same problem. Sadly, the compiled app, does not work, instead it produces the error: Format specifier: d 😪 ---
**Author:** ![ILoveThunkable](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/ilovethunkable/32/3134_2.png) [@ILoveThunkable](https://community.thunkable.com/u/ILoveThunkable)\ **Post date:** [August 2, 2017, 3:33pm UTC](https://community.thunkable.com/t/no-such-class-error-offtopic-working-with-the-app-inventor-sources/6046/2 "2017-08-02T15:33:45Z")
By error, I can see, that your extension, is not being packaged together with your apk. I have a question. If you have multiple extensions, try deleting & using only 1 extension. Also, try using extensions from different developers. It could be an error, that @Taifun had. ---
**Author:** ![Taifun](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/taifun/32/1547_2.png) [@Taifun](https://community.thunkable.com/u/Taifun)\ **Post date:** [August 2, 2017, 4:16pm UTC](https://community.thunkable.com/t/no-such-class-error-offtopic-working-with-the-app-inventor-sources/6046/3 "2017-08-02T16:16:00Z")
for questions about working with the App Inventor sources, please ask in the Open Source Group [https://groups.google.com/forum/#!forum/app-inventor-open-source-dev](https://groups.google.com/forum/#!forum/app-inventor-open-source-dev) Taifun ---
**Author:** ![Sander0542](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/sander0542/32/23253_2.png) [@Sander0542](https://community.thunkable.com/u/Sander0542)\ **Post date:** [August 2, 2017, 5:58pm UTC](https://community.thunkable.com/t/no-such-class-error-offtopic-working-with-the-app-inventor-sources/6046/4 "2017-08-02T17:58:17Z")
You need to download an older commit, look on the forums as @Taifun said. You can find it there ---
**Author:** ![ILoveThunkable](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/ilovethunkable/32/3134_2.png) [@ILoveThunkable](https://community.thunkable.com/u/ILoveThunkable)\ **Post date:** [August 2, 2017, 6:31pm UTC](https://community.thunkable.com/t/no-such-class-error-offtopic-working-with-the-app-inventor-sources/6046/5 "2017-08-02T18:31:38Z")
Latest commit fixed the issues… ---
**Author:** ![Taifun](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/taifun/32/1547_2.png) [@Taifun](https://community.thunkable.com/u/Taifun)\ **Post date:** [August 3, 2017, 12:09am UTC](https://community.thunkable.com/t/no-such-class-error-offtopic-working-with-the-app-inventor-sources/6046/6 "2017-08-03T00:09:43Z")
as already said, the best place to ask about working with the App Inventor sources is the Open Source Forum, because also the experts from the MIT App Inventor team are around to answer questions there… @Sander0542 and @ILoveThunkable as you can see, the issue was something else [https://groups.google.com/d/msg/app-inventor-open-source-dev/gL9bKcMJTyg/SA8OYmr\_BAAJ](https://groups.google.com/d/msg/app-inventor-open-source-dev/gL9bKcMJTyg/SA8OYmr_BAAJ) let me suggest you to also send people to that forum next time instead of trying to answer these questions here… and feel free to answer questions about working with the sources also there… Taifun ---
**Author:** ![Sander0542](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/sander0542/32/23253_2.png) [@Sander0542](https://community.thunkable.com/u/Sander0542)\ **Post date:** [August 3, 2017, 5:42am UTC](https://community.thunkable.com/t/no-such-class-error-offtopic-working-with-the-app-inventor-sources/6046/7 "2017-08-03T05:42:24Z")
I also said that he should look at the App Inventor Forums, because there is a place where it is already discussed ---
**Author:** ![ioannis](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/ioannis/32/146956_2.png) [@ioannis](https://community.thunkable.com/u/ioannis)\ **Post date:** [November 8, 2024, 12:06pm UTC](https://community.thunkable.com/t/no-such-class-error-offtopic-working-with-the-app-inventor-sources/6046/8 "2024-11-08T12:06:24Z")