I'm unable to add a database on a developer machine. I'm running win 10, visual studio 2015. I re-installed SQL server 2016 twice, last time with firewall disabled it all gave green marks in the end.
While i can create databases in VS2015 SQL server object explorer. I am unable to add a SQL database(S) to my projects, trough solution explorer.
Each time i try to add a database to a project i get event 527 SQLLocalDB 12.0 LocalDB parent instance version is invalid: MSSQL13E.LOCALDB
I've tried Start > Run > cmd > sqlcmd -L and it shows my SQLserver
Also made sure it uses the right ports as by (Why am I getting "Cannot Connect to Server - A network-related or instance-specific error"?)
i think that SQL is installed properly but that something is not allowing me to add databases (maybe because some root database?? is missing or so i am not sure i m not an export on SQL, but as the error says some DB seams missing ??
I had something similar and deleted any keys in:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Microsoft SQL Server\UserInstances
that did not have the correct ParentInstance key such as MSSQL13E.LOCALDB.
No need to reinstall or reboot.
I had the same problem for migrating from SQL LocalDb 2016 to 2017.
I simply changed the value of the ParentInstance key from MSSQL13E.LOCALDB
to MSSQL14E.LOCALDB and it worked !
Ty for pointing me to the key HKEY_CURRENT_USER\SOFTWARE\Microsoft\Microsoft SQL Server\UserInstances
I needed to change my install of Microsoft SQL Server LocalDB 2016 Express to 2014, so I uninstalled 2016 then installed 2014. After this I got the following error when ever I tried to attach a database:
LocalDB parent instance version is invalid: MSSQL13E.LOCALDB
To resolve the issue I uninstalled all mention of Microsoft SQL Server 2016 from my computer then deleted the related instance GUIDs from the following registry location, rebooted, installed 2014 LocalDB and all was good:
HKEY_USERS\.DEFAULT\Software\Microsoft\Microsoft SQL Server\UserInstances\
It happened to me when my LocalDB got updated (probably by Visual Studio installer)
I've recreated the instance using following steps:
λ SqlLocalDB delete MSSQLLocalDB
LocalDB instance "MSSQLLocalDB" deleted.
λ SqlLocalDB create MSSQLLocalDB
LocalDB instance "MSSQLLocalDB" created with version 13.1.4001.0.
λ SqlLocalDB start MSSQLLocalDB
LocalDB instance "MSSQLLocalDB" started.
Remember update the Register:
HKEY_USERS\.DEFAULT\Software\Microsoft\Microsoft SQL Server\UserInstances
Check .DEFAULT
I have to do that, because it was wrong and need it to work in Windows Server 2012.
来源：https://stackoverflow.com/questions/40022742/localdb-parent-instance-version-invalid-mssql13e-localdb