Fail to clone repo by ssh-key authentication

[JohnsonLo00]

What I did are listed as follows:

1. Ran ssh-keygen -t ecdsa -C “<my email>” in inner-terminal and no extra contents (e.g. passpharse) was inputted by keeping pressing ENTER;
2. Sequentially copied the content of .ssh/id_ecdsa.pub, id_ecdsa into the authentication setup in setting page;

3. Closed and reopened the app;

4. Created the record of corresponding ssh key in the settings of Github.

Then I tried to clone repo from Github:

1. Did that in UI called from left-side bar, whereas returned an error that authentication callback returned unsupported credentials type;

2. Did that again in terminal by running lg2 clone <. . .>, pressed the dedicated type of ssh key. It requested the same thing again and there seemed to be an error that No user.identityFile found in git config: config value ‘user.identityFile’ was not found.

I am not sure whether it was caused by operational error or bug.