# Error message when "Checking in" materials to material library **URL:** \ **Category:** Bug Reports\ **Created:** [February 3, 2023, 12:31pm UTC](https://prepomax.discourse.group/t/error-message-when-checking-in-materials-to-material-library/708 "2023-02-03T12:31:12Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Tor](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/tor/32/870_2.png) [@Tor](https://prepomax.discourse.group/u/Tor)\ **Post date:** [February 3, 2023, 12:31pm UTC](https://prepomax.discourse.group/t/error-message-when-checking-in-materials-to-material-library/708/1 "2023-02-03T12:31:12Z")
Hello there, When “checking in” a new (or updated) material to the material library i noticed that if no category is selected when clicking if produces the following error. My suggestion would be to change this to something more non-developer user friendly, like “Please select a category for the material to be added”, or something. ![image](https://global.discourse-cdn.com/free1/uploads/prepomax/original/1X/b3ee497a1631daad7f772cce804352741f85537e.png) Happy friday out there. ---
**Author:** ![Matej](https://avatars.discourse-cdn.com/v4/letter/m/a698b9/32.png) [@Matej](https://prepomax.discourse.group/u/Matej)\ **Post date:** [February 5, 2023, 8:38am UTC](https://prepomax.discourse.group/t/error-message-when-checking-in-materials-to-material-library/708/2 "2023-02-05T08:38:24Z")
The error message was changed to a user-friendlier reminder to select a library category. The behaviour of the Delete library material button was modified to always select another existing material after one material is deleted. ---
**Author:** ![Matej](https://avatars.discourse-cdn.com/v4/letter/m/a698b9/32.png) [@Matej](https://prepomax.discourse.group/u/Matej)\ **Post date:** [February 5, 2023, 8:38am UTC](https://prepomax.discourse.group/t/error-message-when-checking-in-materials-to-material-library/708/3 "2023-02-05T08:38:29Z")