The AD FS troubleshooting log detected that the current file has reached the maximum size, but a new file cannot be created ...

The AD FS troubleshooting log detected that the current file has reached the maximum size, but a new file cannot be created to continue the log. 
Directory: %2 
File name: %3 
File size: %5 
Maximum file size: %4 

Troubleshooting information will continue to be written to the current log file, which will exceed the maximum log file size. This event will recur every %1 minutes until the condition is corrected.
Retry period: %1 

User Action 
Check the permissions on the log file directory. 

Additional Data 
This error occurred as a result of a failed attempt to create a new file. 
File to be created: %6 
File creation error: %7