---
tags:
- HowTo
---
# Nextcloud Troubleshooting

## Troubleshooting

### On upgrade singleton not found
#Nextcloud20 

#### Problem

During an update from Nextcloud 19 to 20 the following issue has been thrown.

```
Error: Class 'OCA\Mail\AppInfo\BootstrapSingleton' not found in /var/www/nextcloud/apps/mail/lib/AppInfo/Application.php:35
Stack trace:
```

#### Solution

Manually repeate the upgrade and disable maintenance mode

```bash
docker exec --user www-data nextcloud02 php occ upgrade
docker exec --user www-data nextcloud02 php occ maintenance:mode --off   
```

## Cannot install collabora server
#Nextcloud20

#### Problem

Installation from app store failed.

#### Solution

Run a manual installation.

```
docker exec --user www-data nextcloud02 php -d memory_limit=512M occ app:install richdocumentscode
docker exec --user www-data nextcloud02 php -d memory_limit=512M occ app:remove richdocumentscode
```

### Sync client not autostarting

#### Problem

On the Nextcloud sync client is not started automatically.

#### Solution

Install *GNOME Tweaks* and add Nextcloud to the *Startup Applications*.

### Cannot open document in OnlyOffice

#### Problem

This error occurs:

```
cURL error 3: (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for /hosting/discovery
```

#### Solution

Remove "Office Online Integration" app.