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The Library Manager won't allow space in name. However most of the libraries that come prepopulated have spaces in it. To reproduce start a new standard Java Project, right-click on the "Libraries" item in the "Projects" tab. Select "Add Library...", then click "Manage Libraries...". Then click the "New Library..." button. The dialogue will have "Library Name:" defaulted to "MyLibrary". Now attempt to a space to make it "My Library" and the dialogue will give the message "The library contains invalid characters."
Created attachment 55286 [details] shows the UI not allowing a space in the name
Created attachment 55287 [details] shows pre-existing libraries with spaces in name
Created attachment 55288 [details] *FIXED* shows dialogue not allowing space in name
Reassigning to "projects".
*** This issue has been marked as a duplicate of 46863 ***