[R] Please guide -- Error during export in csv format

[Sunny Singha]

Please guide,
I'm exporting data in '.csv' format in the Windows user directory, I
have full access to. The write operation happens within a for loop.

Each iteration exports data in csv format in the user directory. The
issue is that the  data gets exported for all the 9 iterations but
fails for 10th iteration giving below error message.

Error in file(file, ifelse(append, "a", "w")) :
  cannot open the connection
In addition: Warning message:
In file(file, ifelse(append, "a", "w")) :
  cannot open file './/posts_H<U+1ED9>i nh<U+1EEF>ng ngu<U+1EDD>i
d<U+1ED3>ng hành cùng line_752518568125567.csv': Invalid argument
Called from: file(file, ifelse(append, "a", "w"))

The export directory path is current directory with 'name' extracted as below:
my.file1:  .//likes_H<U+1ED9>i nh<U+1EEF>ng ngu<U+1EDD>i d<U+1ED3>ng
hành cùng line_752518568125567.csv
my.file2:  .//posts_H<U+1ED9>i nh<U+1EEF>ng ngu<U+1EDD>i d<U+1ED3>ng
hành cùng line_752518568125567.csv

I wondering if the error is due to the the complicated filename ?
Below is the line of code I have used within loop to export data.

   my.file1 <- file.path('./', paste0('likes','_',name,'_',grp_id,'.csv'))
    my.file2 <- file.path('./', paste0('posts','_',name,'_',grp_id,'.csv'))

    write.csv(posts_frame, file=my.file2, row.names = F)
    write.csv(likes_frame, file = my.file1, row.names = F)

Regards,
Sunny