filling histograms

From: Robert Loke (loke@ifh.de)
Date: Fri Aug 15 1997 - 12:46:26 MEST 

Hi,

probably it's just a silly mistake ...

I try to fill an existent histogram using 

TH1F* InvMassSpectrum = new TH1F("invariant mass","invariant mass",500,0,5);
 ....
InvMassSpectrum->Fill(InvMass);


and receive such a strange strange error message like 

Error in <TList::AddBefore>: before not fond, object not added

does anybody has an idea what went wrong? Or even better: how to
repair this?

Thanks, Robert


+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+     Robert Loke                                         +
+     Humboldt University Berlin                          +
+     Invalidenstr. 110                                   +
+     10115 Berlin                                        +
+     Germany                                             +
+                                                         +
+     e-mail : loke@ifh.de                                + 
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

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