Why do I get this error?

2019 5 12
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更新时间：2019 5 12
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Hi,
I am using this code to select an area from an image on an axes using the mouse.
r = imrect; % choose the area by drawing a rectangle
fcn = makeConstrainToRectFcn('imrect',get(ax1,'XLim'),get(ax1,'YLim'));
setPositionConstraintFcn(r,fcn);
setResizable(r,false);
rectangle_position = getPosition(r);
rectangle_position = uint8(rectangle_position);
It works but I am getting this error at the end:
"Expected one output from a curly brace or dot indexing expression, but there were 0 results.
Error in imroi/setPositionConstraintFcn (line 210)
obj.api.setPositionConstraintFcn(fcn);
Error in select_area (line 10)
r.setPositionConstraintFcn(fcn);"
Can someone help me please?

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