Unrecognized property string for class Panel

as title

I created the gui which hane one bottom and panel , I want to show data on the panel(name:fitting1)

above is my coding--------------------------------------

function pushbutton2_Callback(hObject, eventdata, handles)
data=xlsread('data1.xlsx');
num1=xlsread('data1.xlsx','A131:A387');
num2=xlsread('data1.xlsx','B131:B387');
x=num1;
y=num2;
fitobject=fit(x,y,'poly1');
a=coeffvalues(fitobject);
set(handles.fitting1,'string','a')

but command window said 'Unrecognized property string for class Panel''

how should i do ? I want someone help

[Abhinav]

A similar question has been answered before have a look

https://www.mathworks.com/matlabcentral/answers/1648955-i-m-getting-a-error-using-get-unrecognized-property-string-for-class-root-in-my-program-all-i-wha

Answer 1

[Steven Lord]

Since handles.fitting1 is a Panel object according to the error message, let's look at the list of Panel properties and see if String is listed among them. It is not. The only three instances of "string" on that page are in the descriptions of allowed types for the Title, Tag, and Tooltip properties. Did you intend to set one of those properties (perhaps the Title?) or a String property of one of the Children of the Panel?

[BOZHENG]

well i saw the inspector , but i edit the tag and tittle ,so I do not really how i should check can you step by step tell me?