Gitkraken: Failed initializing Git Flow

I was have the same issue, and I was solve it run the next command in the root path of project.

git-flow init -d

if command don't appear in your current bash you can follow the next web pages

git flow

git flow bash completation

Support told me this:

For now, try deleting your local develop branch and then try initializing GitFlow to work around the issue.

Example

I'm had the same problem, open git bash terminal and run command: "git flow init" after that open Git kracken and git flow should process normally.