Error: redefinition of a variable

When I try to load the same code a second time in the terminal, it shows the following error.

My understanding is that if you create a variable using “new”, the memory is stored in a heap so you have to use delete command to free the space. However, I have defined the variable normally so it should be stored in stack memory and should be freed after the program ends.

How can I execute my code without getting the following error? Thank you.

this was a limitation of the ROOT interpreter until recently (stemming from the fact that C++ does not like redefinition of variables).

In ROOT v6.22 (or maybe already in v6.20) the situation is greatly improved. What ROOT version are you on?


My ROOT version is 6.16/00.

so that’s it. Please check for available ways to upgrade to a more recent ROOT version.