"reason": "java.io.IOException: (line 2) invalid char between encapsulated token and delimiter"

[Murali_Nagula]

This specific issue happens with activity type code 2 which is form fill out activity especially dealing with downloading attributes. Few other activity types seems to be working fine. We use Snaplogic as a middleware.. not python..Any pointers plz?

[SanfordWhiteman]

Likely you're misinterpreting the inner form payload as JSON, when it's actually PHP object serialization format.

[SanfordWhiteman]

Also, this is in the wrong space. You need to move the thread to https://nation.marketo.com/t5/Products/ct-p/products which is the correct support area.