Error: dropdown doesn't change

Hello, I need help, whe I try to add or remove a item in a dropdown the changes are not saved
on the console appears this: /…/cache/index.php?entryPoint=getImage&themeName=SuiteP&themeName=SuiteP&imageName=sugar-yui-sprites.png 404 (Not Found)

@SANTIAGO

  1. Check permission to files and directories:
    https://docs.suitecrm.com/admin/installation-guide/downloading-installing/#_copying_suitecrm_files_to_web_server
  2. Make “Quick Repair and Rebuild”
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