Got this error when attempting to load a new sprite.

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ERROR in
action number 1
of Other Event: User Defined 0
for object uiFormController:

Trying to draw non-existing sprite.
at gml_Script_system_load_sprite
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stack frame is
gml_Script_system_load_sprite (line -1)
gml_Object_uiFormController_Other_10
called from - gml_Object_obj_fl_tab_Other_13 (line -1) - <unknown source line>
called from - gml_Object_obj_fl_tab_Other_14 (line -1) - <unknown source line>
called from - gml_Object_obj_fl_controller_Step_1 (line -1) - <unknown source line>