After LINGO generates a model, it checks all the nonzero coefficients in the model and computes the ratio of the largest to smallest coefficients.  This ratio is an indicator of how well the model is scaled.  When the ratio gets to be too high, scaling is considered to be poor, and numerical difficulties may result during the solution phase.  If the scaling ratio exceeds the value of the SCALEW parameter, LINGO will display error message 205.  The default value for SCALEW is 1e9.  Instead of simply increasing the SCALEW setting to eliminate error 205, we strongly suggest that you attempt to rescale the units of your model so as to reduce the largest-to-smallest coefficient ratio.