Why Conan shows me "ERROR: Specify the 'user' and the 'channel' or neither of them" when I try to run "conan export-pkg . hello/0.1@myuser/testing"?

I'm trying to use

conan export-pkg . hello/0.1@myuser/testing

command following the tutorial from https://docs.conan.io/en/latest/creating_packages/existing_binaries.html. But conan keeps showing this error message:

ERROR: Specify the 'user' and the 'channel' or neither of them.

It doesn't make any difference if I remove both user and channel.

I tried:

conan export-pkg . hello/0.1
conan export-pkg . hello
conan export-pkg .

And I got the same error every time. What is this error message about and how can be resolved? What am I doing wrong?

My conan version is: 1.29.0

Solution

I've been able to work around this problem after submitting an issue to the Conan developers.

I had changed the storage.path setting in my conan.conf to a top-level folder of drive D:\:

# File: <username>/.conan/conan.conf

# ...

[storage]
# (default) Relative path to a folder in C:\
#path = ./data

# Absolute path to a top-level folder in D:\
path = D:\conan_packages

After a while, it just stopped working.

I worked around this by setting storage.path to a non top-level folder of D:\, e.g.

[storage]
path = D:\conan\packages