CST warning when running an adaptive mesh： unable to save result data

Hi, I have been simulating some microstrpline structures with patch antennas. When I run an adaptive mesh with the transient solver using the expert system, the simulation would give this warning "unable to save result data". I do not get this message when I do not run adaptive mesh. I checked my hard disk space and there is still plenty of space. Can someone help? Thank you

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