System.CalloutException: Web service callout failed: WebService returned a SOAP Fault: INVALID_TYPE: Unknown type:DeployMessage faultcode=sf:INVALID_TYPE faultactor=
please reply how can i resolve this error?

all my test class are having 96% average code coverage in my org,when am trying to packaging its showing below error.
Upload Failed
Average test coverage across all Apex Classes and Triggers is 61%, at least 75% test coverage is required.
please reply me.

i got this error ,please help me,i created question,answers and record type fields in lightning knowlegde object,and added to 3 respective page layouts

Challenge Not yet complete... here's what's wrong: 
There was an unexpected error while verifying this challenge. Usually this is due to some pre-existing configuration or code in the challenge Org. We recommend using a new Developer Edition (DE) to check this challenge. If you're using a new DE and seeing this error, please post to the developer forums and reference error id: DHWCNZEJ.
please reply how can i solve this.

I'm doing the simple lightning components challenge and have hit this problem in my existing trailhead org and a brand new dev org that I've just created:

Challenge not yet complete... here's what's wrong: 
There was an unexpected error while verifying this challenge. Usually this is due to some pre-existing configuration or code in the challenge Org. We recommend using a new Developer Edition (DE) to check this challenge. If you're using a new DE and seeing this error, please post to the developer forums and reference error id: QVWBQHAG