Arithmetic operation resulted in an overflow

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we have a rets feed for Catawba Valley Association of Realtors username:constellation query filter:(OH_StartDateTime=TODAY%2b)

this is the request i am making to create header files for openhouse Request: http://cat.rets.paragonrels.com/rets/...

and this is the erroe we are getiing Error Message: Arithmetic operation resulted in an overflow.

can you look into this