Exporting Excel file with two sheets. Error in activity class

Hello all,

           Having referred to previous entries about Excel file export using Smart Services I've was able to export the Excel file. But my problem is I'm using an Interface which contains a rule that is pointing towards the grid. The main interface has a rule input of (any type) that contains grid. Now the grid will be printed in sheet 2 of the excel file. But I'm getting error in sheet 2 node. ' Examine the activity class to correct the error and then resume.'

 

I've examined few posts already mentioned here by few people. Also, noticed the 'any type' cannot be used for variable types. This post highlights somewhat my issue, https://community.appian.com/discussions/f/process/12046/how-to-save-any-type-variables-value-in-process-model/53330#53330

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