I have developed a CMS program using VB, MS Access as database, Crystal report 8.5

Active Data Report.

It is working fine on my Dev PC but when i install the setup on a client PC,

I works fine but cannot open any report which Error # 91:

ERROR #: 91
DESCRIPTION: Object variable or block variable not set...
Can't locate Database DLL etc...
What is the meaning of this and what is the possible solution please???

What do i need to do or how to solve this problem?

Kindly help me ASAP since the client is worrying me a lot.

Thanks.

I Need Help immediately:
After successfully installed my program to the client, I was called to solved a problem:
ERROR #: 91
DESCRIPTION: Object variable or block variable not set...
Can't locate Database DLL etc...
What is the meaning of this and what is the possible solution please???