Qlik Saas Mashups - 401 error

[MTC_AC]

Need help.

{"errors":[{"title":"Illegal returnto value","code":"LOGIN-8","status":"401"}],"traceId":"5fc630a0b6c4537dfc825c2bc651c318"}

When my Mashup loaded it  should be redirected to tenant login but instead 401 error appeared on my browser.