linker error in Uvision5

Hello gentlemen,

i'm currently struggling trying to link a uc/GUI sample using Uvision 5.

so far compilation passed so i guess  my library headers are found

i added .lib file to my project

when it starts linking i get the following error:

.\Objects\ucGUI.axf: error: L6024U: Library GUI.lib contains an invalid member name.
Not enough information to list image symbols.
Not enough information to list the image map.

must be something silly but i'm running out of ideas there...

would be very gratefull if somebody could help me point where it goes wrong.

Best regards,

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