Конфликт инструкции alter table с ограничением foreign key как исправить

I’m kind of new to scripting in SQL and I have encountered an error in one of my scripts.
The problematic section is:

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE dbo.WorkspaceSettings
(
    Id INT NOT NULL IDENTITY PRIMARY KEY ,
        ReportColorRGB1 VARCHAR(15) NOT NULL DEFAULT '61,105,138' ,
    ReportColorRGB2 VARCHAR(15) NOT NULL DEFAULT '180,210,121' 
)

GO

ALTER TABLE Workspace ADD WorkspaceSettingsId int NOT NULL default 1;

GO
ALTER TABLE Workspace
ADD CONSTRAINT FK_WorkspaceSettings_Workspace
FOREIGN KEY (WorkspaceSettingsId)
REFERENCES WorkspaceSettings(Id);
GO

And receive the following error message:

Msg 547, Level 16, State 0, Line 1
The ALTER TABLE statement conflicted with the FOREIGN KEY constraint «FK_WorkspaceSettings_Workspace». The conflict occurred in database «ClearRisk2_0», table «dbo.WorkspaceSettings», column ‘Id’.

Can someone please tell me where I’m going wrong?

I’m kind of new to scripting in SQL and I have encountered an error in one of my scripts.
The problematic section is:

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE dbo.WorkspaceSettings
(
    Id INT NOT NULL IDENTITY PRIMARY KEY ,
        ReportColorRGB1 VARCHAR(15) NOT NULL DEFAULT '61,105,138' ,
    ReportColorRGB2 VARCHAR(15) NOT NULL DEFAULT '180,210,121' 
)

GO

ALTER TABLE Workspace ADD WorkspaceSettingsId int NOT NULL default 1;

GO
ALTER TABLE Workspace
ADD CONSTRAINT FK_WorkspaceSettings_Workspace
FOREIGN KEY (WorkspaceSettingsId)
REFERENCES WorkspaceSettings(Id);
GO

And receive the following error message:

Msg 547, Level 16, State 0, Line 1
The ALTER TABLE statement conflicted with the FOREIGN KEY constraint «FK_WorkspaceSettings_Workspace». The conflict occurred in database «ClearRisk2_0», table «dbo.WorkspaceSettings», column ‘Id’.

Can someone please tell me where I’m going wrong?