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A: Issues with the parameters of your simulation are the result of an invalid/incorrect input.
Go input by input (skip SS) on the solver block to try and find your issue.
C: Are your geometries connected to Intact Component blocks? Are you defining an appropriate material (make sure to not use thermal materials for stress simulations and vise versa)
R: If you are using fixed restraints, are your geometries attached to a fix restraint block? If you are using displacement boundary conditions, do you have an x, y, and z displacement defined? It is required to have all three translational degrees of freedom defined.
L: Double check all parameters on your loads have been defined. Ensure the load is being placed in the place you want it to be (check geometry). Are you connecting body loads to the loads input? If so, connect those to LV.
LV: This input is for body loads only. These are body weight loads and linear/rotational acceleration loads.
B: The most probable reason for this problem is an incorrectly placed geometry. Each place you reference a geometry from Rhino, select the geometry with the preview enabled. Ensure the geometry it highlights in Rhino is correct.
Also, enable the preview on the solver block. Ensure the loads and restraints are at the right location on the geometry.
Make sure that referenced geometries that are supposed to intersect actually intersect. A load that isn't connected to your geometry can be a reason for this result.
C: Your issue is setting too high of a resolution or too small of a cell size. If you have made your cell size very small to capture small portions of your geometry, increase the cell size. Increasing the cell size decreases the resolution. If the simulation initially said solved, but you couldn't select a solution quantity, your system likely ran out of RAM. Start at a small resolution that solves quickly. For simulation to inform design, a high resolution is not required. If you are running a simulation for very accurate results, increase the resolution by doubling/tripling it until the simulation returns a converged solution. Using the iterative solver is advantageous for decreasing RAM usage.