为什么来自sp_send_dbmail的错误22051未被CATCH块捕获？

Question

所以我有一个sql存储过程：

CREATE PROC sp_SendConfirmedPurchasesEMail
(
    @RecID INT
)
AS
...
msdb.dbo.sp_send_dbmail
            @profile_name                   = @ProfileName,
            @recipients                     = @MailRecipients,
            @body                           = @MsgBody,
            @subject                        = @MailSubject,
            @body_format                    = @BodyFormat, 
            @importance                     = @MsgImportance, 
            @sensitivity                    = @MsgSensitivity, 
            @file_attachments               = 'Some File That Doesnt Exist',
            @query                          = @DBQuery,
            @execute_query_database         = @ExecuteQueryDatabase, 
            @attach_query_result_as_file    = @AttachQueryResultAsFile, 
            @query_attachment_filename      = @QueryAttachmentFilename,
            @query_result_header            = @QueryResultHeader,
            @query_result_width             = @QueryResultWidth,
            @query_result_separator         = @QueryResultSeparator,
            @exclude_query_output           = @ExcludeQueryOutput, 
            @append_query_error             = @AppendQueryError,
            @query_no_truncate              = @QueryNoTruncate,
            @copy_recipients                = @CC,
            @blind_copy_recipients          = @BCC,
            @reply_to                       = @ReplyTo,
            @from_address                   = @FromAddress
 END

我在SSMS中运行时遇到错误：

Msg 22051, Level 16, State 1, Line 0
Attachment file <MyFileGoesHere> is invalid.

我无法弄清楚为什么如果我将TRY / CATCH放在“sp_send_dbmail”的调用周围，我的捕获中没有错误？