Parametric sweep error and selecting geometry inside sphere in Comsol 5

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hamza humayun
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Hi

İ recently started working with Comsol and have a few basic queries. İ am using Comsol version 5.

1. İ am trying to use parametric sweep. So i used it once and saved the file. Now when i try to change the range of sweep it is giving me an error : "parameter list gives empty sweep". When i enter the old range, it starts running fine.

2. İ was trying to use difference operation. İ had created a sphere and placed a box inside it. The problem is once inside the sphere i am not able to select the box, only sphere is highlighted. Why is that?
 
İ have found the solution, so thanks i have nothing to add to this thread