eChecks are pending until accepted by PayPal, which then activates the transaction on Blesta which then provisions the service. PayPal recommend never to issue a service until it is fully paid.
the directory should be created auto when the plugin install . not created mean that the webserver has not the permission to create the directory . try adding it manually
/web/blesta/plugins/css_javascript_toolbox/includes/1/
note the last number is the company_id in blesta , in most case is 1