How to fix the issue with Cypress showing 'supportFile missing or invalid' error even though the file exists in the folder?

One solution to fix the issue with Cypress showing 'supportFile missing or invalid' error even though the file exists in the folder is to make sure that the file is named 'e2e.js' and located in the 'cypress/support' folder. If the file is named differently or located in a different folder, Cypress may not be able to find it. In addition, make sure that the supportFile option in the 'cypress.json' file is not set to false. If it is set to false, change it to 'cypress/support/e2e.js'. If the issue persists, try clearing the Cypress cache by running the command 'npm run clear:cache' or 'yarn clear:cache' in the terminal and then restarting Cypress.