Digital signature : security toolkit error

Hello,

I have a problem in digital signature, when I use the function module SSF_VERSION,

I get an error message

“SSFRFC V1.46.3 No security toolkit version information found”.

1. I have tested the destination conncetion,Workingfine.

2. Security Product is SAPSECULIB.

Could some one help me in solving this issue?

Regards,

Prabhu Rajesh.