Error using mupadengine/feval Invalid equations.

2022 4 27
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I am trying to solve differential equations,but getting the error:
Error using mupadengine/feval Invalid equations.
error dsolve>mupadDsolve (line 334)
T = feval_internal(symengine,'symobj::dsolve',sys,x,options);
error: dsolve (line 403)
sol = mupadDsolve(args, options);
error: test2 (line 42)
Psol(z)=dsolve(eqn,P0)
the variables v,alfa,n,A,keff,ns are defined and known before in the codes;
And there is an unknown parameter a included in P0;
I would like to get solutions with the unknown parameter a through dsolve;
I will appreciate for any help!

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Xinyue
Xinyue
2022-4-27

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