If you face Failed to save undefined: No COMPONENT named markup://use found : [markup://c:AppAssignmentComponent], use <span> tag instead of <use> tag.
Exception:
Failed to save undefined: No COMPONENT named markup://use found : [markup://c:AppAssignmentComponent]
Resolution:
Use <span> tag instead of <use> tag.
Note: Make sure you have created the svg or svgicon lighting component.
Try setting true inside meta.xml file of the component
In addition, ensure your controller has access="global" based on your org setup