SQL Backup failed with exit code: 850

[xdai]

Hi, when I create a backup job which delete prior backup older than 20hours, the job failed, but when i change to 1 day, it is successful, please advice, here is the execute command

EXECUTE master..sqlbackup '-SQL "BACKUP DATABASE [testdb] TO DISK = ''\\xxxx\N$\MSSQL.1\MSSQL\Backup\<AUTO>.sqb'' WITH ERASEFILES_ATSTART = 20H, MAILTO = "test@email.com'', COMPRESSION = 2, THREADCOUNT = 7"', @exitcode OUT, @sqlerrorcode OUT

[Brian Donahue]

Thanks for your post. I've copy/ pasted the query from your previous post and tried to run it (more or less). It seems there is a double-quote after the email address as I get this error:
Syntax error: 'test@email.com'' after '='
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Brian Donahue
Technical Support
Red Gate Software Ltd.
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[xdai]

Here is the command

EXECUTE master..sqlbackup '-SQL "BACKUP DATABASE [testdb] TO DISK = ''\\server\F$\MSSQL.1\MSSQL\Backup\<AUTO>.sqb'' WITH ERASEFILES_ATSTART = 20H, MAILTO = "test@email.com'', COMPRESSION = 2, THREADCOUNT = 7"'

the version is 1.2.