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Sitecore Exception: Input string was not in a correct format.

The Problem

While working on Sitecore on my local, I started getting an exception like this - 

 [FormatException: Input string was not in a correct format.]



Here is the snapshot of the exception - 


The Solution

I found that I was publishing the debug and release versions of a config by mistake. They had placeholder text which needed to be replaced during transformation step in release pipelines. Since no transformation was occurring at my local instance, the config xml was broken and hence erroring out.

Hope it helps you guys!

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