Sql server Report server Error

Hi,
First im Using SQL server 2014

Reporting Services Configuration Manager

Goto Service Account  -->
   Change Use build in account
   to Use another account
after restart the sql Server reorting services i got this message below.
I try rsactivate
C:\Program Files\Microsoft SQL Server\80\Tools\Binn

rsactivate -r -c "C:\Program Files\Microsoft SQL Server\MSSQL\Reporting Services\ReportServer\RSReportServer.config"

But its showing rsactivate is not recogninized

Error rsReportServerDisabled: The report server cannot decrypt the symmetric key used to access sensitive or encrypted data in a report server database. You must either restore a backup key or delete all encrypted content and then restart the service.

Can some one help me to solve this issue.thx
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ukerandiAsked:
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x-menIT super heroCommented:
the encryption key is paired with the service account, when you change the account, you change the encryption key.

To resolve:
-restore the encryption key for the previous service account
OR
- rebuild your data sources
OR
- configure SSRS with the previous service account
- test the data sources,
- backup encryption key
- configure SSRS with the new service account
- restore encryption key
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Microsoft SQL Server 2008

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