UCM Error: EMLoadMap() failed: error opening template file (061C)

Today I had next unexpected UCM Dynamic Converter error:

!csUserEventMessage,weblogic,ucmhost:16200!csFileServiceReferredToBy,http://ucmhost:16200/cs/idcplg?IdcService=GET_DYNAMIC_CONVERSION&dID=614!csFileServiceUserAgent,Mozilla/5.0 (Windows NT 6.1; WOW64; rv:11.0) Gecko/20100101 Firefox/11.0,GET!csFailedToExport,000614,,!csExportProcess,hcexport
intradoc.common.ServiceException: !csFailedToExport,000614,,!csExportProcess,hcexport
*ScriptStack GET_DYNAMIC_CONVERSION_SUB
3:doSubService,dID=614,dDocName=000614GET_DYNAMIC_CONVERSION_SUB,dID=614,dDocName=0006143:runHtmlConversion,dID=614,dDocName=000614
at dynamicconverter.DynConverterHandler.doConversion(DynConverterHandler.java:1422)
at dynamicconverter.DynConverterHandler.runHtmlConversion(DynConverterHandler.java:1125)
at sun.reflect.GeneratedMethodAccessor9853.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at intradoc.server.ServiceHandler.executeAction(ServiceHandler.java:79)
at intradoc.server.Service.doCodeEx(Service.java:533)
at intradoc.server.Service.doCode(Service.java:506)
at intradoc.server.ServiceRequestImplementor.doAction(ServiceRequestImplementor.java:1643)
at intradoc.server.Service.doAction(Service.java:477)
at intradoc.server.ServiceRequestImplementor.doActions(ServiceRequestImplementor.java:1458)
at intradoc.server.Service.doActions(Service.java:473)
at intradoc.server.ServiceRequestImplementor.executeSubServiceCode(ServiceRequestImplementor.java:1323)
at intradoc.server.Service.executeSubServiceCode(Service.java:3867)
at intradoc.server.ServiceRequestImplementor.executeServiceEx(ServiceRequestImplementor.java:1200)
at intradoc.server.Service.executeServiceEx(Service.java:3862)
at intradoc.server.Service.executeService(Service.java:3846)
at intradoc.server.Service.doSubService(Service.java:3761)
at sun.reflect.GeneratedMethodAccessor9638.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at intradoc.server.Service.doCodeEx(Service.java:550)
at intradoc.server.Service.doCode(Service.java:506)
at intradoc.server.ServiceRequestImplementor.doAction(ServiceRequestImplementor.java:1643)
at intradoc.server.Service.doAction(Service.java:477)
at intradoc.server.ServiceRequestImplementor.doActions(ServiceRequestImplementor.java:1458)
at intradoc.server.Service.doActions(Service.java:473)
at intradoc.server.ServiceRequestImplementor.executeActions(ServiceRequestImplementor.java:1391)
at intradoc.server.Service.executeActions(Service.java:458)
at intradoc.server.ServiceRequestImplementor.doRequest(ServiceRequestImplementor.java:737)
at intradoc.server.Service.doRequest(Service.java:1890)
at intradoc.server.ServiceManager.processCommand(ServiceManager.java:435)
at intradoc.server.IdcServerThread.processRequest(IdcServerThread.java:265)
at intradoc.idcwls.IdcServletRequestUtils.doRequest(IdcServletRequestUtils.java:1346)
at intradoc.idcwls.IdcServletRequestUtils.processFilterEvent(IdcServletRequestUtils.java:1715)
at intradoc.idcwls.IdcIntegrateWrapper.processFilterEvent(IdcIntegrateWrapper.java:222)
at sun.reflect.GeneratedMethodAccessor9625.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at idcservlet.common.IdcMethodHolder.invokeMethod(IdcMethodHolder.java:88)
at idcservlet.common.ClassHelperUtils.executeMethodEx(ClassHelperUtils.java:305)
at idcservlet.common.ClassHelperUtils.executeMethodWithArgs(ClassHelperUtils.java:278)
at idcservlet.ServletUtils.executeContentServerIntegrateMethodOnConfig(ServletUtils.java:1600)
at idcservlet.IdcFilter.doFilter(IdcFilter.java:352)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:111)
at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)
at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:413)
at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:94)
at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:161)
at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:136)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:111)
at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)
at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:413)
at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:94)
at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:161)
at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)

followed by:

EMLoadMap() failed: error opening template file (061C).

My UCM was installed in cluster architecture, on Windows 2008 R2 machines.
After few hours googling I found ... nothing.

I thought that there are some IO problems, but after reviewing security privileges also haven't found any issues.
After analyzing logs once again I drew my attention to the process hcexport. As I noticed, it is an external Windows application called directly from java code.
So I started searching for this application and then re-analyzed possible problems: library dependencies, rights, call parameters and I found !!!

The cause of the problem was trivial. We had UCM configuration error. Some paths in config file was defined in "quasi unix", Oracle recommended, manner:

D:/Oracle/FMW/user_projects/....

It works properly, but paths defined as:

//nas_store/ucm_cluster/.....

can't be resolved properly by Windows application, cause they don't comply UNC Name Syntax. The right notation should look like:

\\nas_store\whateever

and finally in translating to the Java path style recommended by Oracle:

\\\\nas_store/ucm_cluster/.....