Problem loading file from Production

Hi everyone,

Sorry for bothering, but we got a problem when trying to Prodyction>Upload a file in our new OJS.
The version is 3.1.1.4
The apache log just says this:

192.17.106.122 - - [18/May/2019:20:45:20 +0200] “GET /ojs/index.php/palaeohispanica/$$$call$$$/wizard/file-upload/file-upload-wizard/start-wizard?fileStage=11&reviewRoundId=&submissionId=21&stageId=5&uploaderRoles=17-16-4097&_=1558204957610 HTTP/1.1” 200 1161 “http://ifc.dpz.es/ojs/index.php/palaeohispanica/workflow/index/21/5” “Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:66.0) Gecko/20100101 Firefox/66.0” 716
192.17.106.122 - - [18/May/2019:20:45:22 +0200] “GET /ojs/index.php/palaeohispanica/$$$call$$$/wizard/file-upload/file-upload-wizard/display-file-upload-form?submissionId=21&stageId=5&uploaderRoles=17-16-4097&fileStage=11&revisionOnly=&reviewRoundId=&revisedFileId=&assocType=&assocId=&dependentFilesOnly= HTTP/1.1” 200 1914 “http://ifc.dpz.es/ojs/index.php/palaeohispanica/workflow/index/21/5” “Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:66.0) Gecko/20100101 Firefox/66.0” 794

And this is what we get:

Selection_028

Any clues??