Error: Specific Heat of material 0.1. How to identify problem material

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I'm trying to model a simple concrete box with a single window in OpenStudio 2.5. When I try to run the simulation, an error occurs when processing the input file. What seems to be the most important line in the error report is:

* Severe * <root>[Material][Material 1][specific_heat] - "0.100000" - Expected number greater than or equal to 100.000000

How can I identify Material 1, and where can I rectify its small specific heat?

I've tried replacing the walls, ceilings and floors with inbuilt ASHRAE CZ1 - office construction sets, but still get the same error. I'm using inbuilt ASHRAE CZ1 windows.

Thanks!