Is there a Native Mobile profile? If so, deploying can only be done local. Mendix Studio Pro 8 is in beta and as such had some limitations. See the release notes:
Running and testing native mobile apps is currently only supported locally (meaning, from Mendix Studio Pro). Currently, app projects with a Native phone profile cannot be deployed to the cloud. This will be fixed with the next beta release.
Thank you in that case how can I covert to older version ? I am not able to roll back to old version.