https://support.microsoft.com/en-au/topic/kb3038267-fix-error-bc30494-line-is-too-long-occurs-when-you-upload-an-ssrs-report-to-reporting-services-report-manager-e1cdf661-0fc7-554e-9801-b90abeaa7815
KB3038267 - FIX: Error "[BC30494] line is too long" occurs when you upload an SSRS report to...
Fixes an issue that occurs when you upload an SSRS report to Reporting Services Report Manager in SSRS 2012 or in SSRS 2014.