Cannot upload files to Tahoe anymore

[Gwenaëlle Fournier]

Hi tahoe dev list,

I come to you with a problem that occurred while switching from tahoe
1.11.0 to 1.13.0.

We have an API to store files using tahoe.
For now we have been using tahoe v1.11.0 but we are thinking of migrating
to tahoe v1.13.0 and I tested doing that on my local environment.

I have been able to v1.13.0 on my environment:
- git clone from master branch
- virtualenv venv
- ./venv/Scripts/pip install --editable .[test]
- create client, node and introducer and configure tahoe.cfg files
Now I can run tahoe and my Tahoe-LAFS WUI shows everything green with my
introducer connected and two nodes (client and node).
Everything seems fine here.

>From our API, I am still able to access the files I had previously uploaded
while still in v1.11.0.

But, and here is my problem, I cannot upload files anymore to tahoe.
*Request* (performed by our API):
PUT =>
http://127.0.0.1:3456/uri/URI:DIR2:qxrozrgcqcsu5y6pbkkmg6v26m:b4vjn7vlqmptnfptfebdq5qnzehruvo5v5oblw7j752gayfsfrpq/636_test.jpg

*Response*:
status: 410
body:  UnrecoverableFileError: the directory (or mutable file) could not be
retrieved, because there were insufficient good shares. This might indicate
that no servers were connected, insufficient servers were connected, the
URI was corrupt, or that shares have been lost due to server departure,
hard drive failure, or disk corruption. You should perform a filecheck on
this object to learn more.

Tahoe exact version: *1.13.0.post1207*

There are *no log files* in client logs, node logs or introducer logs and
nothing also in twistd.log.

I have been able to track the error down in tahoe's code until
*_get_version_from_servermap*() function in
*src/allmydata/mutable/filenode.py* but I don't understand it (I am very
new to tahoe).

An additional problem is that if I switch back to version v1.11.0, I still
have the issue. I surely broke something somewhere...

Could you please help me?

Thanks a lot in advance,

Gwenaelle
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