Must RM .baf file after initial run in order to re-run. also re-install TF each time?

If anyone knows, After running it once, I have to RM the .buf before it will run again. Is this normal?
/mnt/SSD_Model/utils/../workspace/engines/FLOAT/engine_bs_1.buf

I must also pip install tensorflow==1.14 each time as well

I am new to this, so I am sure I am missing something? 