我的matlab用cftool拟合时出错怎么办

创建数据时无法设置权重，只要设置权重为无就出错 错误如下cftool??? Error: Missing variable or function.Error in ==> cftoolgui\private\cftoolmakepreview at 77 y=evalin('base',y);Error in ==> cfswitchyard at 13 [varargout{1:nargout}]=feval(action,varargin{:});MATLAB Listener error in SelectionChangeAction.??? Error: Missing variable or function.??? Error: Missing variable or function.Error in ==> cftoolgui\private\cftoolmakepreview at 82 x=evalin('base',x);Error in ==> cfswitchyard at 13 [varargout{1:nargout}]=feval(action,varargin{:});MATLAB Listener error in SelectionChangeAction.