I believe the attached file ran without errors in 10.2, but in 10.3 In[8] results in:
sol = NDSolveValue[equations /. values, {x[t], y[t]}, {t, 0, 500}];
NDSolve::depdole: The differential order of a dependent variable in {(x^\[Prime])[t],(x^\[Prime]\[Prime])[t],(y^\[Prime])[t],(y^\[Prime]\[Prime])[t]} exceeds the highest order that appears in the differential equations. >>
NDSolve::depdole: The differential order of a dependent variable in {(x^\[Prime])[t],(x^\[Prime]\[Prime])[t],(y^\[Prime])[t],(y^\[Prime]\[Prime])[t]} exceeds the highest order that appears in the differential equations. >>
NDSolve::depdole: The differential order of a dependent variable in {(x^\[Prime])[t],(x^\[Prime]\[Prime])[t],(y^\[Prime])[t],(y^\[Prime]\[Prime])[t]} exceeds the highest order that appears in the differential equations. >>
General::stop: Further output of NDSolve::depdole will be suppressed during this calculation. >>
But I do not see the source of the error. Can anyone else identify the issue?
Kind regards, David
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