Error in file.exists(templateYaml) : "file name conversion problem -- name too long?" issue


I'm experiencing a persistent issue with RStudio on my Windows 10 system and i'm seeking for some solutions. My problem is related to the presence of Turkish characters (like ç, Ç, İ) in my Windows username, which seems to be causing path-related errors in RStudio. But i can't even install packages anymore. Last night my codes were running pretty good but today i'm experiencing this issue. I did what i can. I tried to change my windows username. I reinstalled R and Rstudio. I don't know what to do anymore.
I would greatly appreciate any advice, solutions, or suggestions from the community. Has anyone else faced a similar issue, and if so, how did you resolve it?

Thank you in advance for your help!