Problems with react-scripts: previous post did not work

I have been trying to run a react project using npm install and then npm start. However I am obtaining the following error

> [email protected] build
> react-scripts build

sh: 1: react-scripts: Permission denied

I have been trying to follow the solutions given in this post. However, non of the solutions are working. I don’t know what else to try. If you know of another option, I would be really grateful. Thanks in advance!