Error in as.environment(pos) : using 'as.environment(NULL)' is defunct

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Can someone explain to me what this error means? I'm new to programming so if you can explain it in the most elementary cs terms I would very much appreciate it.

I get this error message from R Studio when trying to process other code from time to time, but I'll give the most current example:

In this case, I'm trying to find out what functions are in the jpeg package

 ls(jpeg())

and im getting this error in return:

Error in as.environment(pos) : using 'as.environment(NULL)' is defunct
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