Sync not working on NAS: "Unable to add filesystem watch"

[ghsucre]

MEGAcmd version

2.1.1

Operating System/Platform

Synology

Platform version. In the case of Linux, please enter the Linux distribution you are using.

DSM 7.2.2-72806 Update 3 (INTEL Celeron J4025)

Steps

1. Download GeminiLake MEGA-cmd version 2.1.1 package from: https://mega.nz/folder/ogBQnbKa#CoRlU5uarTf4XpY3TbPELQ/folder/9lJiCJzI
2. Install the package as 3rd party package through the Package Center
3. Access the NAS shell using SSH from my PC (using putty)
4. Running "sudo mega-cmd" and logging in
5. Setting up a new sync "sync /path/to/local/folder /folder/in/mega"
   After failing to activate the sync using root, I set up mega-cmd on an administrator account and tried again, same result.
   Note:
   An older version of the files (exact folder structure) was already in my MEGA account, since I had an old backup using a container that stopped working a while ago.

Expected behavior

I would expect sync to work, and maybe notify me if there are conflicts or anything that prevent it from failing.

Actual behavior

The sync starts running, comparing the folders, but then halts with a message: "Unable to add filesystem watch".
In another attempt I manages to get some sync issues about inaccessible folders, nothing significant, but every enda with that filesystem watch error.
Attaching log

megacmdserver (1).log

[polmr]

Hello ghsucre.

I think this would help.

In order for sync to work, it needs to be able to watch as many folders as you have within your synchronized paths.
By default, max_user_watches may be somewhat limited in your Synology. In the above link you have instructions to increase that limit.

[ghsucre]

Hi
Thanks for your answer @polmr
What number should I set for this parameter?
Does it depend on my device / sync size, or should the number given in the guide as a temporal fix (131072) should be ok?
Thanks

[polmr]

A number > the number of folders within your synced folders.

That one is a good enough high number, but of course, can always be beaten by whatever you are syncing ;-)

As a reference, MEGAcmd configures a higher one(524288) in other operating systems by default. These numbers are quite generous, as you can imagine.