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I deleted all the files from my workspace, and reinstall everythink. And it solves my error. Thank you for your help BennyRe and Srelingm

I deleted all the files from my workspace, and reinstall everythink. And it solves my error. Thank you for your help BennyRe and SrelingmSterlingm

I deleted all the files from my workspace, and reinstall everythink. And it solves my error. Thank you for your help BennyRe and SterlingmSterlingm. However, i got this error :

Waiting on transform from base_link to map to become available before running costmap, tf error: 
[ WARN] [1406882852.669591743]: No laser scan received (and thus no pose updates have been published) for 1406882852.669489 seconds.  Verify that data is being published on the /scan topic.

I already faced this issue in groovy, and i was unable to found a solution. http://answers.ros.org/question/187967/groovy-how-to-link-scan-to-base_link/