Multisite Select Categories Drop Down Not Working

Hello,
I am running a multi-site .I have installed site categories plugin https://premium.wpmudev.org/project/site-categories/.This plugin helps me to select the sub sites to particular category and display in main site.But i am unable to select category because drop down is not functioning. To clear this i have tried uninstall and reinstall the plugin and disabled all the plugin no use. https://prntscr.com/dqpoxj 2.Net i have done fresh install of multisite it works perfectly.https://prntscr.com/dqpskc. Kindly help me to resolve this issue.I don’t want to lose my site data.