TopLevelControl Librarium_Options cannot be parented to LAMAddonSettingsWindowPanelContainer, it must be parented to GuiRootstack traceback:
[C]: in function 'SetParent'
user:/AddOns/InventorySpaceDisplay/Libs/
TopLevelControl Librarium_Options cannot be parented to LAMAddonSettingsWindowPanelContainer, it must be parented to GuiRootstack traceback:
[C]: in function 'SetParent'
user:/AddOns/InventorySpaceDisplay/Libs/
The better thread would be the above thread because getting the mod to work requires removing the old libraries, LibStub for LibAddonMenu in the .lua file, and editing the manifest text file.
Either deinstall the addon InventorySpaceDisplay or remove the libraries in subfolders and install them properly as described in the linked posts.
Especially read and follow
"If the addon is old and still uses "LibStub" (an obsolete library for versioning)"
And
"If you see dependencies in subfolders (e.g. "libs") of addons"
And next time if you register for a new forum READ and SEARCH first, especially the sticky posts at the top of the help forums, before you create a new thread please! This is common sense (or at least should be).