Error, (in ds) cannot evaluate the solution further right of .31854882, maxfun limit exceeded (see ?dsolve,maxfun for details)

its ok, this is exactly what should be ther, and its not affect on procedure.

order of (leng, alpha) does not matter here, this is stuped procedure thet created just only to fix this erorr

Error, (in XX) parameter 'alpha' must be assigned a numeric value before obtaining a solution