If you redid routes and get error that it can't handle you just need to upgrade the link between them ie if you can click on the link that goes from spaceport to extractor double click it to open it then upgrade link if not select extractor you will see link icon there click on it double click on the link to the spaceport then upgrade it one step if its still not enough do it again.
And remember for the extractor if extracts faster then your processors work so you will loose mats if you do not run to storage first even if there same speed you will loose some believe me always route to storage then from storage to processor and that goes for each p lvl as well ie route your p0 to storage then out p1 to storage then out and so on.
If you have not looked at stuff on this site you may want to very useful stuff on here
http://wiki.eveuniversity.org/Planetary_Interaction
some is a bit outdated but a lot of it has been updated for the changes to extractors now i think.
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