No puedo cargar archivos / I can not upload files

¡Buenos días a todos!

Cada vez que intento subir archivos a través de la versión me sale salta el mismo error…
Tengo 2 instalaciones y ambos me da el mismo error.

Versión: “13.0.5.2”

core.js?v=ec031261-9:4 PUT http://cloud…/index.php/apps/files/ 403 (Forbidden)
send @ core.js?v=ec031261-9:4
ajax @ core.js?v=ec031261-9:4
send @ merged-index.js?v=ec031261-9:2713
(anonymous) @ core.js?v=ec031261-9:2
j @ core.js?v=ec031261-9:2
add @ core.js?v=ec031261-9:2
(anonymous) @ core.js?v=ec031261-9:2
each @ core.js?v=ec031261-9:2
(anonymous) @ core.js?v=ec031261-9:2
a.Deferred @ core.js?v=ec031261-9:7
then @ core.js?v=ec031261-9:2
_onSend @ merged-index.js?v=ec031261-9:2757
(anonymous) @ core.js?v=ec031261-9:13
data.submit @ merged-index.js?v=ec031261-9:2481
(anonymous) @ merged-index.js?v=ec031261-9:571
(anonymous) @ core.js?v=ec031261-9:2
j @ core.js?v=ec031261-9:2
add @ core.js?v=ec031261-9:2
(anonymous) @ core.js?v=ec031261-9:2
each @ core.js?v=ec031261-9:2
(anonymous) @ core.js?v=ec031261-9:2
a.Deferred @ core.js?v=ec031261-9:7
then @ core.js?v=ec031261-9:2
submit @ merged-index.js?v=ec031261-9:570
(anonymous) @ merged-index.js?v=ec031261-9:860
.each..forEach @ core.js?v=ec031261-9:166
submitUploads @ merged-index.js?v=ec031261-9:858
onNoConflicts @ merged-index.js?v=ec031261-9:1257
checkExistingFiles @ merged-index.js?v=ec031261-9:1061
add @ merged-index.js?v=ec031261-9:1275
_trigger @ core.js?v=ec031261-9:13
(anonymous) @ merged-index.js?v=ec031261-9:2844
each @ core.js?v=ec031261-9:2
_onAdd @ merged-index.js?v=ec031261-9:2837
(anonymous) @ core.js?v=ec031261-9:13
(anonymous) @ merged-index.js?v=ec031261-9:3042
j @ core.js?v=ec031261-9:2
add @ core.js?v=ec031261-9:2
always @ core.js?v=ec031261-9:2
_onChange @ merged-index.js?v=ec031261-9:3032
(anonymous) @ core.js?v=ec031261-9:13
u @ core.js?v=ec031261-9:13
dispatch @ core.js?v=ec031261-9:3
r.handle @ core.js?v=ec031261-9:3
merged-index.js?v=ec031261-9:644 Uncaught TypeError: Cannot read property ‘documentElement’ of undefined
at OC.FileUpload.getResponse (merged-index.js?v=ec031261-9:644)
at HTMLInputElement.fail (merged-index.js?v=ec031261-9:1317)
at e.(/index.php/apps/files/anonymous function).(anonymous function)._trigger (http://cloud.acuchar.es/core/vendor/core.js?v=ec031261-9:13:10075)
at e.(/index.php/apps/files/anonymous function).(anonymous function)._onFail (http://cloud.acuchar.es/index.php/js/files/merged-index.js?v=ec031261-9:2683:18)
at e.(/index.php/apps/files/anonymous function).(anonymous function)._onFail (http://cloud.acuchar.es/core/vendor/core.js?v=ec031261-9:13:5077)
at Object. (merged-index.js?v=ec031261-9:2717)
at j (core.js?v=ec031261-9:2)
at Object.fireWith [as rejectWith] (core.js?v=ec031261-9:2)
at x (core.js?v=ec031261-9:4)
at XMLHttpRequest. (core.js?v=ec031261-9:4)

{
“id”: “oc65vysu5nr6”,
“items”: [
[
“server”,
“version”,
“13.0.5.2”
],
[
“server”,
“code”,
“other”
],
[
“server”,
“enable_avatars”,
“yes”
],
[
“server”,
“enable_previews”,
“yes”
],
[
“server”,
“memcache.local”,
“\OC\Memcache\ArrayCache”
],
[
“server”,
“memcache.distributed”,
“none”
],
[
“server”,
“asset-pipeline.enabled”,
“no”
],
[
“server”,
“filelocking.enabled”,
“yes”
],
[
“server”,
“memcache.locking”,
“\OC\Memcache\ArrayCache”
],
[
“server”,
“debug”,
“no”
],
[
“server”,
“cron”,
“ajax”
],
[
“php”,
“version”,
“7.0.31”
],
[
“php”,
“memory_limit”,
536870912
],
[
“php”,
“max_execution_time”,
3600
],
[
“php”,
“upload_max_filesize”,
629145600
],
[
“database”,
“type”,
“sqlite3”
],
[
“database”,
“version”,
“3.7.17”
],
[
“database”,
“size”,
380928
],
[
“apps”,
“gallery”,
“disabled”
],
[
“apps”,
“serverinfo”,
“1.3.0”
],
[
“apps”,
“provisioning_api”,
“1.3.0”
],
[
“apps”,
“federation”,
“1.3.0”
],
[
“apps”,
“nextcloud_announcements”,
“1.2.0”
],
[
“apps”,
“logreader”,
“2.0.0”
],
[
“apps”,
“activity”,
“2.6.1”
],
[
“apps”,
“files_trashbin”,
“1.3.0”
],
[
“apps”,
“sharebymail”,
“1.3.0”
],
[
“apps”,
“survey_client”,
“1.1.0”
],
[
“apps”,
“files”,
“1.8.0”
],
[
“apps”,
“lookup_server_connector”,
“1.1.0”
],
[
“apps”,
“notifications”,
“2.1.2”
],
[
“apps”,
“dav”,
“1.4.7”
],
[
“apps”,
“updatenotification”,
“1.3.0”
],
[
“apps”,
“firstrunwizard”,
“2.2.1”
],
[
“apps”,
“workflowengine”,
“1.3.0”
],
[
“apps”,
“systemtags”,
“1.3.0”
],
[
“apps”,
“files_videoplayer”,
“1.2.0”
],
[
“apps”,
“twofactor_backupcodes”,
“1.2.3”
],
[
“apps”,
“oauth2”,
“1.1.1”
],
[
“apps”,
“theming”,
“1.4.5”
],
[
“apps”,
“files_versions”,
“1.6.0”
],
[
“apps”,
“files_sharing”,
“1.5.0”
],
[
“apps”,
“comments”,
“1.3.0”
],
[
“apps”,
“federatedfilesharing”,
“1.3.1”
],
[
“apps”,
“files_texteditor”,
“2.5.1”
],
[
“apps”,
“password_policy”,
“1.3.0”
],
[
“apps”,
“theming_customcss”,
“1.1.0”
],
[
“apps”,
“ownbackup”,
“18.8.1”
],
[
“stats”,
“num_files”,
224
],
[
“stats”,
“num_users”,
4
],
[
“stats”,
“num_storages”,
5
],
[
“stats”,
“num_storages_local”,
1
],
[
“stats”,
“num_storages_home”,
4
],
[
“stats”,
“num_storages_other”,
0
],
[
“stats”,
“num_comments”,
0
],
[
“stats”,
“num_comment_markers”,
0
],
[
“stats”,
“num_systemtags”,
0
],
[
“stats”,
“num_systemtags_mappings”,
0
],
[
“files_sharing”,
“num_shares”,
0
],
[
“files_sharing”,
“num_shares_user”,
0
],
[
“files_sharing”,
“num_shares_groups”,
0
],
[
“files_sharing”,
“num_shares_link”,
0
],
[
“files_sharing”,
“num_shares_link_no_password”,
0
],
[
“files_sharing”,
“num_fed_shares_sent”,
0
],
[
“files_sharing”,
“num_fed_shares_received”,
0
],
[
“encryption”,
“enabled”,
“no”
],
[
“encryption”,
“default_module”,
“no”
]
]
}

Añado Error: Call to undefined method OC_Theme::getDocBaseUrl()
Add: Error: Call to undefined method OC_Theme::getDocBaseUrl()

Que versión de PHP estas usando?