CHALLENGE-UNSOLVEDQUES

Dear, if you know anything about it, Please let me. Thanks in advance !

Git Checkout

1. I checkout a branch name “normal” and renamed some files, then checkout to master, when I tried to checkout to normal again, an error occured. Like the following picture:
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Java JNI

1. When I using JNI, a error named can not find native method library occured. The detail like the following pictures:
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AVISPA

1. 

2. I have done everything as the user manual presented. But there are still some error, I don’t know why.

Android

1. What is the meaning of the following code? especially api?
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Git Branch

1. I used git init initialised a android project folder, then I tried to use git branch to manager the branches, but it came out nothing, it is wired ?
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