Font missing when exporting to PDF

Hi, 

I have folowing problem. 

In one of our reports we are using Arial and Times New Roman as fonts. 

We are using Jasper Server 5.6.0 CE

We have managed to get good output on html when report is generated. I've instaled font to studio, named it, checked embededd to pdf buton, exported it to jar and added to clasess for JasperServer, but when we try to export it to pdf  we get folowing error:

"java.lang.IllegalArgumentException: path cannot be empty "

What to do ?