Why I get the equation that I've written back instead of the solution?

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I have this equation that I've written in Mathematica. I don't know why I get the same equation back instead of a solution. Is the syntax correct? BTW, v is energy, L is angular momentum, a takes the values 0 and 1 only and d is a whole number beginning with 2. I don't know how to define these values neither. I'm just trying to get a general solution then put different values. hope somebody could suggest something here. enter image description here

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You made a type and put DSolvv[] instead of DSolve[]