Making certificate

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C#3.5

Hi. Certificates is giving me some problems. I´m now into things I don´t really understand.

I’ve Created a Certificate to act as Root Certificate Authority and it´s OK:
1) C:\VS\makecert -n "CN=RootCATest" -r -sv RootCATest.pvk RootCATest.cer
2) I’ve made my Console in mmc and everything is OK:
3) Now I´m trying to Create and Install my Temporary Service Certificate:
C:\VS\makecert -sk MyKeyName -iv RootCATest.pvk -n "CN=tempCert" -ic RootCATest.cer -sr localmachine -ss my -sky exchange -pe tempCert.cer
In the map VS, the file tempCert.pvk exists!

And I get this erro message:
C:\vs\Can´t access the key of the issuer <’tempCert.pvk’>
Failed

Question:
1) What do I do wrong?
2) Is there a way to code this in C#

Best to you all