Solved
You should attach the worksheet, not only a picture, and state which version of Prime you are using.
All i can see in your picture is that:
- alpha and beta are undefined.
- There appears to be a multiplication symbol (*) missing:
- in the first differential equation, between C(s) and (mu.m...)
- in the other two DE's between D and (1+R.1), which makes D seem like a function.
For alpha=beta=1, I get:

Success!
Luc
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