is there any solution fo Resourcespace, error using “Replace file” option Server side error!

When trying to replace a file on resource,

Server side error! Please check the log and contact the system administrator!

Checking the resourcespace code, on the file /pages/upload_plupload.php, the only message on the entire with this error message:

....
upRedirBlock = true;
                                    uploaderrormessage = 'Server side error! Please check the log and contact the system administrator!';
                                    jQuery("#upload_log").append("\r\n" + jQuery('' + info.response.replace(/\s\s/g," ") + '').text());
                                    styledalert("", uploaderrormessage );
....