SharePoint Master Page Invalid error usually happens if incorrect Master page is not present in the site’s Master page gallery or your value on the ‘MasterPageFile’ feature points to an invalid. This error may corrupt your site’s database. To overcome this situation, you have to complete some manual steps to repair SharePoint master page error. These steps are too confusing and take extreme time to complete. After complete the task to repair master page error in SharePoint designer, try to check out the page and edit it. If you still noticed that issue, and it specify the corruption in database of site’s content then you need expert help. So as to successfully fix corrupted SharePoint database, you can try recommended SharePoint recovery software. This application has integrated with some latest and user-friendly techniques to accomplish the task of recovering SharePoint Server database in effortless manner. It has comprehensive scanning mode which helps the administrator to handle or tackle even a worst corruption conditions and make recovery so simple and accurate. It provides two exporting mode (“SQL Server database” and “SQL Server Compatible SQL Script”) to save the repaired MDF file items. Use “SQL Server database” to save repaired items in existing SQL database and “SQL Server Compatible SQL Script” to save all SQL scripts in definite folder. Try the free demo version of SharePoint recovery software and see the functionalities and working features. To know more: http://www.sharepointrecovery.org/sharepoint-masterpage-invalid-error