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This is mysterious, as SwapSpaceMonitor$MonitorTask has serialVersionUID=1L since 2008 (or Hudson 1.312). So there's no jar in circulation that does not have the field.
As unlikely as it is, I'm reluctantly suspecting some Java version having a problem. If you see InvalidClassException on SwapSpaceMonitor.MonitorTask please report your Java version of the slave. The slave name in question is reported in the error message.