How to make work?

I am trying to read a network data by running following code, but the error message reminds the function not available. Does extra package need to be install? Thank you!

here is the error message:
Error in :
could not find function ""


sysfile <- system.file('extdata/luades-smoking.gemtc', package='gemtc')
net <-

It looks like an older version of the gemtc package has the function

How to install this version of package? Thank you.

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