Hello,

I am trying to solve the coupled system of PDEs. Maple throws below error(highlighyted in bold letters) when I try to solve it using 'pdsolve'. Attached is the maple worksheet(BatteryPDEEquationsBackUp8thJuly13_constantCurrentInput.mw) having complete code. Please help. 

> pds := pdsolve(BatSys, IBC, numeric, variables, time = t, range = 0 .. L[N]+L[sep]+L[P]);

Error, (in pdsolve/indexlex) invalid input: a string/name list is expected for sort method `string`...