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The following error message may appear when you start a re-simulationResimulation:
"Cannot start the Re-Simulation! Please make sure the simulation was run with the 'Velocity' channel checked under the 'Output' rollout, and that the cache files in the Resimulation Input path exist."
The reason may be that either the files in the Resimulation's Input Path do not exist at all, or they do not have velocity Velocity exported when you have simulated them beforehand.
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