Content database selection Disable (Auto detect) in site collection migration.

Hi,

I am facing an issue when migrating Sharepoint 2010 to 2013 Site collection not able to choose content database in Site collection option.

I am using a trial license 

https://drive.google.com/file/d/1AjO3DkFb9uYG7UbElNf3KX_FgPtbHpUe/view?usp=sharing