Problem in launching jupyer notebook in anaconda navigator

when i try to launch jupyter notebook in navigator, i see following error message "Unable to create process using 'C:\Users\DILBER IQBAL.conda\envs\tensorflow\python.exe “C:\Users\DILBER IQBAL.conda\envs\tensorflow\Scripts\jupyter-notebook-script.py” ':. i checked these files in relevent directories and found here but without .exe.