You should clear the caches in Chrome because the browser can use up all memory when you do not clear the caches. Since you have not cleared the caches, PrimeLister is failing to operate the listing tasks due to insufficient available memory. You may need to clear the cache every month. You will need to log in to Poshmark & Mercari again after clearing the cache.
1) Please right-click on the page and click the Inspect option.
2) Click Application, Clear storage and Clear site data button. After that you have to sign in mercari.com again and use PrimeLister properly.