We reached the end of the buffer - Dataflow

I have the following dataflow containing :

The Entity and the GL/Mapping (I am sharing only screenshots for Entity since the GL/Mapping has the same) are failing to retrieve data when I check them, the sources seems to be pointing to inexisting dataflows :

When I check the workspace it is existing but the Dataflow I get this message :

The workspace pointing to the dataflow exists but the dataflow is missing but the error message is different :

I get this error message :

We reached the end of the buffer

section Section1;

shared #"AFAS Openingsbalans" = let

  /*#"2018" = let

    Source = Sql.Database("XXXXXXXXXXX.database.windows.net", "XXXXXXXXXXX"),

    afas_vw_FinancieleMutaties_Current = Source{[Schema="afas",Item="vw_getAllEmps"]}[Data],

    #"Filtered Rows" = Table.SelectRows(afas_vw_FinancieleMutaties_Current, each ([Jaar] < 2018) and ([Administratie_code] <> 1) and ([Administratie_code] <> 2) and [Dagboek_code] = "99"),

    #"Removed Other Columns" = Table.SelectColumns(#"Filtered Rows",{"Administratie_code", "Rekeningnummer", "Rekening_omschrijving", "Bedrag_saldo", "Verzamelen_op_rekeningnummer"}),

    #"Grouped rows" = Table.Group(#"Removed Other Columns", {"Administratie_code", "Rekeningnummer", "Rekening_omschrijving", "Verzamelen_op_rekeningnummer"}, {{"Bedrag_Saldo", each List.Sum([Bedrag_saldo]), type number}}),

    #"Added Year" = Table.AddColumn(#"Grouped rows", "Year", each 2018),

    #"Added Period" = Table.AddColumn(#"Added Year", "Period", each 0),

    #"Renamed columns" = Table.RenameColumns(#"Added Period", {{"Bedrag_Saldo", "Amount"}})

  in

    #"Renamed columns",

  #"2019" = let

    Source = Sql.Database("XXXXXXXXXXX.database.windows.net", "XXXXXXXXXXX"),

    afas_vw_FinancieleMutaties_Current = Source{[Schema="afas",Item="vw_getAllEmps"]}[Data],

    #"Filtered Rows" = Table.SelectRows(afas_vw_FinancieleMutaties_Current, each ([Jaar] < 2019) and ([Administratie_code] <> 1) and ([Administratie_code] <> 2)),

    #"Removed Other Columns" = Table.SelectColumns(#"Filtered Rows",{"Administratie_code", "Rekeningnummer", "Rekening_omschrijving", "Bedrag_saldo", "Verzamelen_op_rekeningnummer"}),

    #"Grouped rows" = Table.Group(#"Removed Other Columns", {"Administratie_code", "Rekeningnummer", "Rekening_omschrijving", "Verzamelen_op_rekeningnummer"}, {{"Bedrag_Saldo", each List.Sum([Bedrag_saldo]), type number}}),

    #"Added Year" = Table.AddColumn(#"Grouped rows", "Year", each 2019),

    #"Added Period" = Table.AddColumn(#"Added Year", "Period", each 0),

    #"Renamed columns" = Table.RenameColumns(#"Added Period", {{"Bedrag_Saldo", "Amount"}})

  in

    #"Renamed columns",

  #"2020" = let

    Source = Sql.Database("XXXXXXXXXXX.database.windows.net", "XXXXXXXXXXX"),

    afas_vw_FinancieleMutaties_Current = Source{[Schema="afas",Item="vw_getAllEmps"]}[Data],

    #"Filtered Rows" = Table.SelectRows(afas_vw_FinancieleMutaties_Current, each ([Jaar] < 2020) and ([Administratie_code] <> 1) and ([Administratie_code] <> 2)),

    #"Removed Other Columns" = Table.SelectColumns(#"Filtered Rows",{"Administratie_code", "Rekeningnummer", "Rekening_omschrijving", "Bedrag_saldo", "Verzamelen_op_rekeningnummer"}),

    #"Grouped rows" = Table.Group(#"Removed Other Columns", {"Administratie_code", "Rekeningnummer", "Rekening_omschrijving", "Verzamelen_op_rekeningnummer"}, {{"Bedrag_Saldo", each List.Sum([Bedrag_saldo]), type number}}),

    #"Added Year" = Table.AddColumn(#"Grouped rows", "Year", each 2020),

    #"Added Period" = Table.AddColumn(#"Added Year", "Period", each 0),

    #"Renamed columns" = Table.RenameColumns(#"Added Period", {{"Bedrag_Saldo", "Amount"}})

  in

    #"Renamed columns",

  #"2021" = let

    Source = Sql.Database("XXXXXXXXXXX.database.windows.net", "XXXXXXXXXXX"),

    afas_vw_FinancieleMutaties_Current = Source{[Schema="afas",Item="vw_getAllEmps"]}[Data],

    #"Filtered Rows" = Table.SelectRows(afas_vw_FinancieleMutaties_Current, each ([Jaar] < 2021) and ([Administratie_code] <> 1) and ([Administratie_code] <> 2)),

    #"Removed Other Columns" = Table.SelectColumns(#"Filtered Rows",{"Administratie_code", "Rekeningnummer", "Rekening_omschrijving", "Bedrag_saldo", "Verzamelen_op_rekeningnummer"}),

    #"Grouped rows" = Table.Group(#"Removed Other Columns", {"Administratie_code", "Rekeningnummer", "Rekening_omschrijving", "Verzamelen_op_rekeningnummer"}, {{"Bedrag_Saldo", each List.Sum([Bedrag_saldo]), type number}}),

    #"Added Year" = Table.AddColumn(#"Grouped rows", "Year", each 2021),

    #"Added Period" = Table.AddColumn(#"Added Year", "Period", each 0),

    #"Renamed columns" = Table.RenameColumns(#"Added Period", {{"Bedrag_Saldo", "Amount"}})

  in

    #"Renamed columns", */