We recently upgraded the MVC 6 project to beta2, and NetNet complains that it cannot use System.Convert. Can someone tell me where it was moved?

My JSON project contains the following for Core:
"aspnetcore50": {
"dependencies": {
"System.Runtime": "4.0.20-beta-22416",
"System.Threading.Tasks": "4.0.10-beta-22416",
"System.Net.Http": "4.0.0-beta-22416",
"Newtonsoft.Json": "6.0.6.0",
"System.Collections": "4.0.10-beta-22416"
}
}
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