tde revert

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SQL-Server

Hi,
I have encrypted "MyDatabase" by TDE ; but when i want to decrypt it by this
command:
ALTER DATABASE MyDatabase SET ENCRYPTION = OFF;
i receive this error:
Msg 33109, Level 16, State 1, Line 1
Cannot disable database encryption while an encryption, decryption, or key
change scan is in progress.
Msg 5069, Level 16, State 1, Line 1
ALTER DATABASE statement failed.
what is the solution?