ERROR on R Studio

Hi all,
I have problems starting R Studio on my MacBook
i have this error

Error in .External2(C_dataentry, data, modes) :
unable to start data editor
In addition: Warning message:
In dataentry(odata, as.list(Modes)) :
unable to create fontset --fixed-medium-r----120------

Can someone guide me to sort this out...

thanks
Santo

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