Question: I do not understand where I have went wrong

Could someone pleease clarify this error message below.

sol1 := dsolve({syst, theta1(0) = (1/2)*Pi, theta2(0) = (1/4)*Pi, (D(theta1))(0) = 0, (D(theta2)(0) = 0}, theta1(t), theta2(t), type = numeric, output = listprocedure);
Error, (in dsolve/numeric/process_input) system must be entered as a set/list of expressions/equations
 

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