Unable to remove shared file/folder

[sjash]

Steps to reproduce

1. Create a file/folder from a user.Go to sharing options and type the user/group you want to share with.
2. Un-share option doesn't appear for user who is sharing.
3. It appears for the users/group members to whom it is being shared

Expected behaviour

If an user has shared an file/folder to any specific user/group/by email, then it should be able to revert in case of any mistakes.

Actual behaviour

If an user has shared an file/folder to any specific user/group/by email un-share option doesn't appear for user who is sharing but appears for the user whom it is being shared.

Server configuration

Operating system: Centos 7.2

Web server: Apache 2.4

Database: Mysql 5.6

PHP version: 7.0.6

Nextcloud version: 15.0.2

**Updated from an older Nextcloud/ownCloud or fresh install: Update from ver 14

Where did you install Nextcloud from:

Signing status:

Signing status

Login as admin user into your Nextcloud and access 
http://example.com/index.php/settings/integrity/failed 

No errors have been found.

List of activated apps:

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your Nextcloud installation folder
 accessibility: 1.1.0
  - activity: 2.8.2
  - admin_audit: 1.5.0
  - bruteforcesettings: 1.3.0
  - checksum: 0.4.2
  - cloud_federation_api: 0.1.0
  - comments: 1.5.0
  - dav: 1.8.1
  - encryption: 2.3.0
  - federatedfilesharing: 1.5.0
  - federation: 1.5.0
  - files: 1.10.0
  - files_antivirus: 2.0.0
  - files_downloadactivity: 1.4.0
  - files_external: 1.6.0
  - files_pdfviewer: 1.4.0
  - files_rightclick: 0.11.0
  - files_sharing: 1.7.0
  - files_texteditor: 2.7.0
  - files_trashbin: 1.5.0
  - files_versions: 1.8.0
  - files_videoplayer: 1.4.0
  - firstrunwizard: 2.4.0
  - gallery: 18.2.0
  - groupfolders: 2.0.2
  - logreader: 2.0.0
  - lookup_server_connector: 1.3.0
  - metadata: 0.9.0
  - nextcloud_announcements: 1.4.0
  - notifications: 2.3.0
  - oauth2: 1.3.0
  - password_policy: 1.5.0
  - provisioning_api: 1.5.0
  - richdocuments: 3.1.1
  - serverinfo: 1.5.0
  - sharebymail: 1.5.0
  - socialsharing_email: 1.0.5
  - support: 1.0.0
  - survey_client: 1.3.0
  - systemtags: 1.5.0
  - tasks: 0.9.8
  - terms_of_service: 1.1.1
  - theming: 1.6.0
  - theming_customcss: 1.2.0
  - twofactor_backupcodes: 1.4.1
  - updatenotification: 1.5.0
  - user_ldap: 1.5.0
  - workflowengine: 1.5.0


</details>

**Nextcloud configuration:**
<details>
<summary>Config report</summary>

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your Nextcloud installation folder
"system": {
"instanceid": "REMOVED SENSITIVE VALUE",
"passwordsalt": "REMOVED SENSITIVE VALUE",
"secret": "REMOVED SENSITIVE VALUE",
"trusted_domains": [
"cloud.example.in",
"10.10.1.222",
"10.10.1.111"
],
"datadirectory": "REMOVED SENSITIVE VALUE",
"overwrite.cli.url": "https://cloud.example.in",
"dbtype": "mysql",
"version": "15.0.2.0",
"dbname": "REMOVED SENSITIVE VALUE",
"dbhost": "REMOVED SENSITIVE VALUE",
"dbport": "3306",
"dbtableprefix": "oc_",
"dbuser": "REMOVED SENSITIVE VALUE",
"dbpassword": "REMOVED SENSITIVE VALUE",
"logtimezone": "Asia/Kolkata",
"installed": true,
"ldapIgnoreNamingRules": false,
"ldapProviderFactory": "\OCA\User_LDAP\LDAPProviderFactory",
"auth.bruteforce.protection.enabled": false,
"trusted_proxies": "REMOVED SENSITIVE VALUE",
"mail_smtpmode": "smtp",
"mail_from_address": "REMOVED SENSITIVE VALUE",
"mail_domain": "REMOVED SENSITIVE VALUE",
"enable_previews": true,
"preview_max_scale_factor": 10,
"ppstoreurlpreview_libreoffice_path": "/usr/bin/libreoffice",
"preview_office_cl_parameters": " --headless --nologo --nofirststartwizard --invisible --norestore -convert-to pdf -outdir ",
"loglevel": 2,
"logfile": "/mnt/cloud-data/nextcloud.log",
"enable_avatars": true,
"knowledgebaseenabled": false,
"appcodechecker": true,
"lost_password_link": "https://auth.example.in/service/?action=sendtoken",
"enable_certificate_management": false,
"memcache.local": "\OC\Memcache\APCu",
"maintenance": false,
"mail_smtpauthtype": "PLAIN",
"mail_smtphost": "REMOVED SENSITIVE VALUE",
"mail_smtpport": "465",
"mail_smtpdebug": true,
"mail_smtpauth": 1,
"mail_smtpsecure": "ssl",
"mail_smtpname": "REMOVED SENSITIVE VALUE",
"mail_smtppassword": "REMOVED SENSITIVE VALUE",
"updater.release.channel": "stable",
"log_rotate_size": 52428800,
"session_lifetime": 1800
}

Are you using external storage, if yes which one: local/smb/sftp/ -- YES

Are you using encryption: NO

Are you using an external user-backend, if yes which one: LDAP

Client configuration

Browser: Firefox v64/Chrome 71

Operating system: Windows/ Ubuntu/Centos

[mickymadsystems]

I had the same problems and I solved it by deactivating the application Social sharing via email.

[sjash]

@mickymadsystems Thanks it solved my problem.
But any info there anything that is blocking that option if social sharing via email is enabled?

[violoncelloCH]

that's a bug which should be fixed by #13738 in NC15.0.3 see nextcloud/socialsharing#29 (comment)