Hi Eshwar,

The length of the key 
<https://developers.google.com/adwords/api/docs/reference/v201609/CampaignService.CustomParameter>
 field 
should be between 1 and 16 characters. Looks like you might be using a 
string value which exceeds this limit. Could you please check and let me 
know if that is indeed the case? If not, could you also provide me with the 
SOAP XML for the request part of the API call? From the API response and 
error message, my guess, in that case, would be that you might be violating 
one of the system limits 
<https://developers.google.com/adwords/api/docs/appendix/limits> with one 
or more parameters used in the creation of the campaign. 

Regards,
Vishal, AdWords API Team

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