[GRASS5] [bug #3469] (grass) about i.class

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this bug's URL: http://intevation.de/rt/webrt?serial_num=3469
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Subject: about i.class

Platform: GNU/Linux/i386
grass obtained from: CVS
grass binary for platform: Compiled from Sources

 I am working with GRASS61, I try with i.class for supervised classification. After drawing the region on image I click to the Analyze region Menu, I get this error message WARNING:PREPARE_SIGNATURE: DATA ERROR (CLICK MOUSE TO CONTINUE). It seem that all the regions that I chose before now disappear. I try again with GRASS57, the result is also the same. Can you solve this problem for me? Thank you very much,
Best regards,
Tran Van Anh

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