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Vinothini RajanVinothini Rajan 

System.CalloutException: Web service callout failed: Failed to deserialize value 'NULL', due to:For input string: "NULL"

Hello,

SOAP Web Services which was working before suddenly fails in both Sandbox and Production.

Error : System.CalloutException: Web service callout failed: Failed to deserialize value 'NULL', due to:For input string: "NULL"

As a admin i'm struggling to find what went wrong. Guide me in finding the cause.
VinayVinay (Salesforce Developers) 
Hi Rajan,

You need to use SOAP UI tool to check what is the cause for error and why it's failing.

Would need a developer to debug the issue and fix the callout exception.

References related to callout error:

https://salesforce.stackexchange.com/questions/57067/soap-callout-error-failed-to-deserialize-value
https://salesforce.stackexchange.com/questions/279022/system-calloutexception-web-service-callout-failed-unable-to-find-field-status

Also tried to check if there is any known issue but haven't found anything related.

Thanks,
Vinay Kumar