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stream out error when disabled "stream out from virtual memory"

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Hi, I meet a problem when trying to stream out the layout.

If enabled the iption "stream out from virtual memory", there would be an error message saying "Pcell evaluation failed for xxx because the pcell SKILL code contains either a syntax error or an unsupported XStream function. Check the standard output or the Virtuoso log file for more information. Either correct the pcell SKILL code or ignore the error by enabling the 'ignorePcellEvalFail' option for XStream Out.".

But if I enabled "stream out from virtual memory", then there will be no such error message and the final gds can be generated. The gds is exactly what i drawed, no obvious error.

I am curious about the reason for this. What is the difference between enable and disbale the option? 

Thanks a lot !


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