Hi Rohan.
Maybe you are using a Include Text wich is empty, you should try to Check the option "No error if no exists"
The other option is that your are calling an Fuction Module o using a Table/structure/data element wich is not active or doesn't exist. A simple way to check this is run manually the smartforms by the transacction SMARTFORMS in the MANDT where you are getting the error, like this.
If you get a dump or an error, can help you ton determinate what the error is.