REF error chart

[wise11]

hi
why appear this popup if there is no error. i do not know why
http://www.up-00.net/do.php?img=894 this window happen when i insert chart after minutes turns to balnk


here when series is as picture it is correct no error before turns balnk
http://www.up-00.net/do.php?img=891

here when series is #REF as picture it is wrong get error after problem
http://www.up-00.net/do.php?img=890

Why turns to #REF? id on not know why?how i prevent (edit series)turns to #REF

[jeffreybrown]

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