I changed my old computer. The new computer runs with OS is windows 8 - 64 bits. I have the following error message:
ERROR Problem occured
ExceptionConverter: java.security.SignatureException: Error interno.
at sun.security.mscapi.RSASignature.signHash(Native Method)
at sun.security.mscapi.RSASignature.engineSign(RSASignature.java:390)
at java.security.Signature$Delegate.engineSign(Unknown Source)
at java.security.Signature.sign(Unknown Source)
at com.lowagie.text.pdf.PdfPKCS7.getEncodedPKCS7(Unknown Source)
at net.sf.jsignpdf.SignerLogic.signFile(SignerLogic.java:375)
at net.sf.jsignpdf.SignerLogic.run(SignerLogic.java:109)
at java.lang.Thread.run(Unknown Source)
INFO Finished: Creating of signature failed.