Unable to delete folder

[MiguelIsaza27]

First time i see this error, what does it mean?

[21:07:53 WRN]  ERROR: Unable to delete folder c:\temp\WorkItemAttachmentWorkingFolder\55291
[21:07:53 INF] [             Support][Complete:     6/6][sid: 55291|Rev: 24][tid:  null | ...Saved as 366999
[21:07:53 INF] [             Support][Complete:     6/6][sid: 55291|Rev: 24][tid:  null | Average time of 14.661 per work item and 0 hours 0 minutes 14.661 seconds estimated to completion
[21:07:53 INF] DONE in 00:04:37.5527829
[21:07:53 INF]  Migration Context Complete WorkItemMigration
[21:07:53 INF] Application is shutting down...
[21:07:53 DBG] Hosting stopping
[21:07:53 DBG] Exiting with return code: 0
[21:07:53 INF] Application Ending
[21:07:53 INF] The application ran in 00:10:23.7682998 and finished at 06/13/2023 21:07:53