Cannnot apply autoyast profile in a existing OS

[klash-yang]

Bug Reproduce

Using sudo yast2 autoyast ui filename=sles15.xml to apply below profile

<?xml version="1.0"?>
<!DOCTYPE profile>
<profile xmlns="http://www.suse.com/1.0/yast2ns" xmlns:config="http://www.suse.com/1.0/configns">
  <proxy>  
    <enabled config:type="boolean">true</enabled>  
    <ftp_proxy />  
    <http_proxy>http://10.84.82.87:10806</http_proxy>  
    <https_proxy />  
    <no_proxy>localhost,127.0.0.1</no_proxy>  
    <proxy_password />  
    <proxy_user />  
  </proxy> 
</profile>

Error Message

Error: Internal error. Please report a bug report with logs.
Run save_y2logs to get complete logs.
Caller: /usr/share/YaST2/clients/inst_autoconfigure.rb:147:in `main'
Details: undefined method `fetch_as_hash' for #<Hash:0x00005626b30218>
Did you mean?  fetch_values