Application giving "Conversion to Dalvik format failed with error 1" error while trying to run

I have developed an android application.But when i try to run the code its shows error message

Description Resource   Path             开发者_StackOverflowLocation   Type
---------------------------------------------------------------------------------
Conversion to Dalvik   VMSApplication   Unknown    Android Packaging Problem
format failed with 
error 1

Has someone faced this problem before...

Thanks in advance

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[2011-06-24 16:34:45 - VMSApplication] Dx   at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:242)
[2011-06-24 16:34:45 - VMSApplication] Dx   at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
[2011-06-24 16:34:46 - VMSApplication] Dx 1 error; aborting
[2011-06-24 16:34:46 - VMSApplication] Conversion to Dalvik format failed with error 1

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You don't say what version of the android SDK you are running or what platform. You might try this solution for Windows 7 Solution:

Confirmed the problem is caused by ProGuard command line in the file
[Android SDK Installation Directory]\tools\proguard\bin\proguard.bat

Edit the following line will solve the problem:

call %java_exe% -jar "%PROGUARD_HOME%"\lib\proguard.jar %*

to

call %java_exe% -jar "%PROGUARD_HOME%"\lib\proguard.jar %1 %2 %3 %4 %5 %6 %7 %8 %9

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One solution could be to clean and restart the eclipse,this may help.Also check out these links link1 and link2

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I got that error because I was trying to build when connected to emulator