DIsk or database full

I have a 40 GB disk and it says the database is full, why??

Backup started at 6/6/2022 11:02:09 AM
The supplied option --temp-dir is not supported and will be ignored
Checking remote backup ...
  Listing remote folder ...
Scanning local files ...
  0 files need to be examined (0 bytes)
  2356 files need to be examined (1.53 GB)
  2349 files need to be examined (1.43 GB)
  2343 files need to be examined (1.40 GB)
  2335 files need to be examined (1.28 GB)
Fatal error => Insertion failed because the database is full
database or disk is full
  0 files need to be examined (0 bytes)

Mono.Data.Sqlite.SqliteException (0x80004005): Insertion failed because the database is full
database or disk is full
  at Mono.Data.Sqlite.SQLite3.Reset (Mono.Data.Sqlite.SqliteStatement stmt) [0x00096] in <3903fae468ee4cf992c5b1715eb9eb97>:0 
  at Mono.Data.Sqlite.SQLite3.Step (Mono.Data.Sqlite.SqliteStatement stmt) [0x00046] in <3903fae468ee4cf992c5b1715eb9eb97>:0 
  at Mono.Data.Sqlite.SqliteDataReader.NextResult () [0x00129] in <3903fae468ee4cf992c5b1715eb9eb97>:0 
  at Mono.Data.Sqlite.SqliteDataReader..ctor (Mono.Data.Sqlite.SqliteCommand cmd, System.Data.CommandBehavior behave) [0x00051] in <3903fae468ee4cf992c5b1715eb9eb97>:0 
  at (wrapper remoting-invoke-with-check) Mono.Data.Sqlite.SqliteDataReader..ctor(Mono.Data.Sqlite.SqliteCommand,System.Data.CommandBehavior)
  at Mono.Data.Sqlite.SqliteCommand.ExecuteReader (System.Data.CommandBehavior behavior) [0x00006] in <3903fae468ee4cf992c5b1715eb9eb97>:0 
  at Mono.Data.Sqlite.SqliteCommand.ExecuteNonQuery () [0x00000] in <3903fae468ee4cf992c5b1715eb9eb97>:0 
  at Mono.Data.Sqlite.SqliteTransaction.Commit () [0x00031] in <3903fae468ee4cf992c5b1715eb9eb97>:0 
  at Duplicati.Library.Main.Operation.Common.DatabaseCommon.Dispose (System.Boolean isDisposing) [0x0000f] in <e60bc008dd1b454d861cfacbdd3760b9>:0 
  at Duplicati.Library.Main.Operation.Common.SingleRunner.Dispose () [0x00000] in <e60bc008dd1b454d861cfacbdd3760b9>:0 
  at Duplicati.Library.Main.Operation.BackupHandler.RunAsync (System.String[] sources, Duplicati.Library.Utility.IFilter filter, System.Threading.CancellationToken token) [0x01048] in <e60bc008dd1b454d861cfacbdd3760b9>:0 
  at CoCoL.ChannelExtensions.WaitForTaskOrThrow (System.Threading.Tasks.Task task) [0x00050] in <9a758ff4db6c48d6b3d4d0e5c2adf6d1>:0 
  at Duplicati.Library.Main.Operation.BackupHandler.Run (System.String[] sources, Duplicati.Library.Utility.IFilter filter, System.Threading.CancellationToken token) [0x00009] in <e60bc008dd1b454d861cfacbdd3760b9>:0 
  at Duplicati.Library.Main.Controller+<>c__DisplayClass14_0.<Backup>b__0 (Duplicati.Library.Main.BackupResults result) [0x0004b] in <e60bc008dd1b454d861cfacbdd3760b9>:0 
  at Duplicati.Library.Main.Controller.RunAction[T] (T result, System.String[]& paths, Duplicati.Library.Utility.IFilter& filter, System.Action`1[T] method) [0x0026f] in <e60bc008dd1b454d861cfacbdd3760b9>:0 
  at Duplicati.Library.Main.Controller.Backup (System.String[] inputsources, Duplicati.Library.Utility.IFilter filter) [0x00074] in <e60bc008dd1b454d861cfacbdd3760b9>:0 
  at Duplicati.CommandLine.Commands.Backup (System.IO.TextWriter outwriter, System.Action`1[T] setup, System.Collections.Generic.List`1[T] args, System.Collections.Generic.Dictionary`2[TKey,TValue] options, Duplicati.Library.Utility.IFilter filter) [0x00119] in <eb902dee3a2c4c3fbc8192580b4a42b2>:0 
  at (wrapper delegate-invoke) System.Func`6[System.IO.TextWriter,System.Action`1[Duplicati.Library.Main.Controller],System.Collections.Generic.List`1[System.String],System.Collections.Generic.Dictionary`2[System.String,System.String],Duplicati.Library.Utility.IFilter,System.Int32].invoke_TResult_T1_T2_T3_T4_T5(System.IO.TextWriter,System.Action`1<Duplicati.Library.Main.Controller>,System.Collections.Generic.List`1<string>,System.Collections.Generic.Dictionary`2<string, string>,Duplicati.Library.Utility.IFilter)
  at Duplicati.CommandLine.Program.ParseCommandLine (System.IO.TextWriter outwriter, System.Action`1[T] setup, System.Boolean& verboseErrors, System.String[] args) [0x00342] in <eb902dee3a2c4c3fbc8192580b4a42b2>:0 
  at Duplicati.CommandLine.Program.RunCommandLine (System.IO.TextWriter outwriter, System.IO.TextWriter errwriter, System.Action`1[T] setup, System.String[] args) [0x00002] in <eb902dee3a2c4c3fbc8192580b4a42b2>:0 

any idea?? thanks

Do you mean you have 40 GB free? If this is Linux can you do this command and show us the output:

# df -h