Error pattern in block

hi,

I'm trying to do "pattern" to a URL with a simple block of cocoon and I 
have this error:

<exception-report 
class="sun.security.provider.certpath.SunCertPathBuilderException" 
timestamp="Sat, 16 Feb 2013 20:32:37 +0100">
<message>
unable to find valid certification path to requested target
</message>
<stacktrace>
sun.security.provider.certpath.SunCertPathBuilderException: unable to 
find valid certification path to requested target at 
sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:174) 
at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:238) at 
sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:318) at 
sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:217) 
at sun.security.validator.Validator.validate(Validator.java:218) at 
com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:126) 
at .....................

The block is this:

<map:pipeline>
     <map:match pattern="product">
       <map:generate src="https://projectwebproduct/file-form.html" />
       <map:serialize type="xml"/>
     </map:match>
   </map:pipeline>

Can the problem by URL "https://"?,
Thanks.

-- 
Antonio M. Mérida -- codeBusters.es