Syntax error at buffered='yes' in an open statement
The problem lies in the buffered='yes', which is not standard Fortran, but some vendor extension and your compiler does not recognize it. I would just delete it and also delete the buffercount=127 (mentioned in the comment).
Modern compilers and operating systems allow control of these things (external I/O buffering) by other means. For example, using environment variables in gfortran https://gcc.gnu.org/onlinedocs/gfortran/Runtime.html#Runtime