# Cannot run sample app HelloWorld

**URL:** <https://mangoh.discourse.group/t/cannot-run-sample-app-helloworld/5036>\
**Category:** mangOH Red\
**Created:** [August 17, 2020, 3:42pm UTC](https://mangoh.discourse.group/t/cannot-run-sample-app-helloworld/5036 "2020-08-17T15:42:07Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![stephaneroy](https://avatars.discourse-cdn.com/v4/letter/s/e47c2d/32.png) [@stephaneroy](https://mangoh.discourse.group/u/stephaneroy)\
**Post date:** [August 17, 2020, 3:42pm UTC](https://mangoh.discourse.group/t/cannot-run-sample-app-helloworld/5036/1 "2020-08-17T15:42:07Z")

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Hi All, I have a magoh red board and I have using the mangoh VM strainght from the site.

I can successfully start a leaf shell, compile and install the helloWorld application, but when I run it I have the following error:

Jan 17 21:05:53 swi-mdm9x28 user.info Legato: INFO | supervisor[632]/supervisor T=main | app.c CreateTmpFs() 1231 | Mounted tmpfs at /legato/systems/current/appsWriteable/helloWorld/tmp.  
Jan 17 21:05:53 swi-mdm9x28 user.info Legato: INFO | supervisor[632]/supervisor T=main | app.c CreateFileLink() 1583 | Created file link ‘/tmp/legato/serviceDirectoryServer’ to ‘/legato/systems/current/appsWriteable/helloWorld/tmp/legato/serviceDirectoryServer’.  
Jan 17 21:05:53 swi-mdm9x28 user.info Legato: INFO | supervisor[632]/supervisor T=main | app.c CreateFileLink() 1583 | Created file link ‘/tmp/legato/serviceDirectoryClient’ to ‘/legato/systems/current/appsWriteable/helloWorld/tmp/legato/serviceDirectoryClient’.  
Jan 17 21:05:53 swi-mdm9x28 user.info Legato: INFO | supervisor[632]/supervisor T=main | proc.c proc\_Start() 1394 | Starting process ‘helloWorld’ with pid 19634  
Jan 17 21:05:53 swi-mdm9x28 user.info Legato: INFO | supervisor[19634]/supervisor T=main | proc.c proc\_Start() 1359 | Execing ‘helloWorld’  
Jan 17 21:05:53 swi-mdm9x28 user.err Legato: =ERR= | helloWorld[19634] | helloWorld: symbol lookup error: /lib/libComponent\_helloComponent.so: undefined symbol: le\_log\_RegComponent  
Jan 17 21:05:53 swi-mdm9x28 user.info Legato: INFO | supervisor[632]/supervisor T=main | proc.c proc\_SigChildHandler() 2040 | Process ‘helloWorld’ (PID: 19634) has exited with exit code 127.  
Jan 17 21:05:53 swi-mdm9x28 user.warn Legato: -WRN- | supervisor[632]/supervisor T=main | app.c app\_SigChildHandler() 3373 | Process ‘helloWorld’ in app ‘helloWorld’ faulted: Ignored.  
Jan 17 21:05:53 swi-mdm9x28 user.info Legato: INFO | supervisor[632]/supervisor T=main | apps.c DeactivateAppContainer() 349 | Application ‘helloWorld’ has stopped.

Anyone knows why I would get the “undefined symbol: le\_log\_RegComponent” error?

Thanks  
Stéphane

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<div class="post-metadata">

**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\
**Post date:** [August 17, 2020, 3:51pm UTC](https://mangoh.discourse.group/t/cannot-run-sample-app-helloworld/5036/2 "2020-08-17T15:51:59Z")

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Probably the version of legato app is not matched with module legato version