EOS-新手问答：
- 2018-06-28 Error 3050003 assertion failure with message: invalid sell
- 2018-06-28 Error 3050000 Cannot create account named xxxxxx, as that name is already taken
- 2018-06-28 error 3050003 assertion failure with message: symbol precision mismatch
- 2018-06-28 Error 3050003 assertion failure with message: overdrawn balance
- 2018-06-28 Error 3050003 assertion failure with message: no balance object found
- 2018-06-28 Error 3050003 assertion failure with message: invalid sell
- 2018-06-28 Error 3050000 Cannot create account named xxxxxx, as that name is already taken
- 2018-06-28 error 3050003 assertion failure with message: symbol precision mismatch
- 2018-06-28 Error 3050003 assertion failure with message: overdrawn balance
- 2018-06-28 Error 3050003 assertion failure with message: no balance object found