Mupad: ode::solve showing error" equation is not ordinary"

VED NAMRUB

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Joined
Mar 25, 2019
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1
I am trying to solve the partial differential equation using MuPad while solving the equation in the third image the last line the differential equation is of the function of z and while solving it for U(z) its shows error as shown in the third image.
When I changed the code the error remains.
The first two images show the complete code
line1.JPGline2.JPGline3.JPGline4.JPG
 
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