Error at equilibration step, unable to access the topol.top file

Dear Bioinformaticsreview, I am learning to perform simulations in Gromacs through your uploaded tutorials. I appreciate your content and explanation on the webpage and the youtube channel. while practicing by watching the video, I am getting errors at the equilibration step as follows: Error in user input:Invalid command-line optionsIn command-line option -rFile name \’topol.top\’ cannot be used for this option.Only the following extensions are possible:.gro, .g96, .pdb, .brk, .ent, .esp, .tpr but in the uploaded video tutorial in the youtube, \’topol.top\’ file was accessed. Can you please inform me how and at which I have to rectify to solve that error?   Thank you, Mallari Praveen.