# Hello World Compile Errors Open AT 3.02

**URL:** <https://forum.sierrawireless.com/t/hello-world-compile-errors-open-at-3-02/444>\
**Category:** Development tools\
**Created:** [May 10, 2006, 1:53pm UTC](https://forum.sierrawireless.com/t/hello-world-compile-errors-open-at-3-02/444 "2006-05-10T13:53:29Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![thirdparty](https://avatars.discourse-cdn.com/v4/letter/t/ec9cab/32.png) [@thirdparty](https://forum.sierrawireless.com/u/thirdparty)\
**Post date:** [May 10, 2006, 1:53pm UTC](https://forum.sierrawireless.com/t/hello-world-compile-errors-open-at-3-02/444/1 "2006-05-10T13:53:29Z")

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When I try and run the sample Hello World program, I get the following linker errors:

```auto
LINK : error LNK2001: unresolved external symbol _opecCustomerTaskInit
hello_world.obj : error LNK2001: unresolved external symbol _wm_osDebugTrace
hello_world.obj : error LNK2001: unresolved external symbol _wm_osGetTask
hello_world.obj : error LNK2001: unresolved external symbol _wm_osStartTimer
hello_world.obj : error LNK2001: unresolved external symbol _wm_atSendUnsolicitedExternalApp
rte/vc6/Release/Hello_World_rte.dll : fatal error LNK1120: 5 unresolved externals
Error executing link.exe.
```

Any help would be appreciated.

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**Author:** ![OpenAT\_Fan](https://avatars.discourse-cdn.com/v4/letter/o/f07891/32.png) [@OpenAT\_Fan](https://forum.sierrawireless.com/u/OpenAT_Fan)\
**Post date:** [May 11, 2006, 5:18am UTC](https://forum.sierrawireless.com/t/hello-world-compile-errors-open-at-3-02/444/2 "2006-05-11T05:18:48Z")

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Hi,  
From your errors, it seems that you are using the Basic Mode of Open-AT application development.

From the errors, it can be found that the Open-AT environment is not able to resolve the APIs and function calls. To solve this, please check that you have correctly specified the Open-AT library to link with your application.

To solve the problem, please go to the project settings-\>link and give “rte\_wmopenat\_302.b03.lib” in the Object/library modules. Please note that this library file contains the definitions for the APIs that are called in the Hello World sample application. This library file is present in “C:\OpenAT\V302\TgtGen\Library” directory. Please check if this file is present in this library.  
Also specify the above path in the Options-\>Directories-\>Library path to provide the path for this library.

Best Regards,  
Open AT Fan.