Error: "The folder is locked by a different ShortPixel process"

When using our ShortPixel Website Optimizer that offers you a web interface to our API, available to any PHP website, you may encounter an issue like this:

This may happen if one launches two browser windows with the optimization page or even refreshes the page while optimizing.

To solve this, all you need to do is wait for a minute or two and then relaunch the process.

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