[Gate-users] Problem with Initialization of Geometry

[Xinjie Cao]

Dear all,

I am running a simulation with new geometry of our model, but the GATE
always stucks with following problem:
```
List of initialized processes:
[Core-0] Initialization of geometry
GateMaterialDatabase.cc (l.131): GateMaterialDatabase: could not find the
definition for material '0' in material files

```
I am not sure what is the problem with this error, but I have checked my
macro many times without any definition for material '0'. Has anyone ever
met this problem before? Any answer will be highly appreciated. Thank you!

Best,
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