Linear fit 'Equation is badly conditioned. Remove repeated data points or try centering and scaling'

Dear all,

Here is my data,

735637  -0.0535
735677  0.427
735701  0.304
735709  0.288

Where x is column 1 and y is column 2. When I fit with [fit,gof] = fit(x,y,'poly1'), it I got the following warnings:

Warning: Equation is badly conditioned. Remove repeated data points or try centering and scaling. 
In curvefit.attention.Warning/throw (line 30)
In fit>iLinearFit (line 672)
In fit>iFit (line 383)
In fit (line 108)
In plotRbLSWISeries (line 6)|

And if I run [fit,gof] = fit(x,y,'poly1') twice, it tell me:

K>> [fit,gof] = fit(x,y,'poly1')
Error using cfit/subsref
Too many output arguments.

What's the problem? and how to solve this problem? thank you!