While creating any folder on server, floder name should be like
Go to QMC -> Data Connection -> Select your Folder -> Edit and remove Doamin Name & User Name and refresh it.
Then, Go to Hub Refresh it and load it.
For Ex:- After Creating Connection in Qlik Sense Server, Data Connection name should be QVD(DomainName/UserName),
Go to QMC -> Data Connection -> Select "QVD(DomainName/UserName)" -> Edit and remove Doamin Name/User Name.