Error with pdf preview on Windows

An error occurs when the converter try to persist the cache:

15:36:12,075 ERROR ConversionCacheHolder Error while trying to persit cache en
try
java.lang.NullPointerException
at java.io.File.<init>(File.java:194)
at org.nuxeo.ecm.core.convert.cache.ConversionCacheEntry.persist(Convers
ionCacheEntry.java:54)
at org.nuxeo.ecm.core.convert.cache.ConversionCacheHolder.doAddToCache(C
onversionCacheHolder.java:111)
at org.nuxeo.ecm.core.convert.cache.ConversionCacheHolder.addToCache(Con
versionCacheHolder.java:100)
at org.nuxeo.ecm.core.convert.service.ConversionServiceImpl.convert(Conv
ersionServiceImpl.java:175)
at org.nuxeo.ecm.platform.preview.adapter.base.ConverterBasedHtmlPreview
Adapter.getPreviewBlobs(ConverterBasedHtmlPreviewAdapter.java:161)
at org.nuxeo.ecm.platform.preview.adapter.base.ConverterBasedHtmlPreview
Adapter.getPreviewBlobs(ConverterBasedHtmlPreviewAdapter.java:110)
at org.nuxeo.ecm.platform.preview.adapter.base.AbstractHtmlPreviewAdapte
r.getFilePreviewBlobs(AbstractHtmlPreviewAdapter.java:123)
at org.nuxeo.ecm.platform.preview.restlet.PreviewRestlet.initCachedBlob(
PreviewRestlet.java:140)
at org.nuxeo.ecm.platform.preview.restlet.PreviewRestlet.handle(PreviewR
estlet.java:89)
at org.nuxeo.ecm.platform.ui.web.restAPI.ThreadSafeRestletFilter.doHandl
e(ThreadSafeRestletFilter.java:61)
at org.restlet.Filter.handle(Filter.java:134)
at org.restlet.Filter.doHandle(Filter.java:105)
at org.restlet.Filter.handle(Filter.java:134)
at org.restlet.Router.handle(Router.java:444)
at com.noelios.restlet.ext.servlet.ServletConverter.service(ServletConve
rter.java:129)
at org.nuxeo.ecm.platform.ui.web.restAPI.RestletServlet.service(RestletS
ervlet.java:131)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
at org.nuxeo.ecm.platform.ui.web.rest.FancyURLFilter.doFilter(FancyURLFi
lter.java:116)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
at org.nuxeo.ecm.platform.ui.web.auth.NuxeoAuthenticationFilter.doFilter
(NuxeoAuthenticationFilter.java:462)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
at org.nuxeo.ecm.platform.web.common.requestcontroller.filter.NuxeoReque
stControllerFilter.doFilter(NuxeoRequestControllerFilter.java:106)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
at org.nuxeo.ecm.platform.web.common.exceptionhandling.NuxeoExceptionFil
ter.doFilter(NuxeoExceptionFilter.java:61)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFi
lter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:175)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(Securit
yAssociationValve.java:182)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValv
e.java:84)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedC
onnectionValve.java:157)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:262)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ss(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:44
6)
at java.lang.Thread.run(Thread.java:595)
15:36:12,075 ERROR PreviewRestlet could not build preview for missing blob at
default