In order for anyone to be able to help you, you will need to locate the underlying error messages in either your Browser's DevTools (if it's a frontend error) or in the dspace.log file (if it's a backend error). Once you locate the issue, it's possible it might be one of the common installation issues listed at
https://wiki.lyrasis.org/display/DSDOC7x/Installing+DSpace#InstallingDSpace-CommonInstallationIssues If it's not in that list, then feel free to send an updated email to this mailing list, making sure to provide the full error message(s).