The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or an illegal character among the padding characters.
at System.Convert.FromBase64_Decode(Char* startInputPtr, Int32 inputLength, Byte* startDestPtr, Int32 destLength) at System.Convert.FromBase64CharPtr(Char* inputPtr, Int32 inputLength) at System.Convert.FromBase64String(String s) at Microsoft.IdentityModel.Tokens.Base64UrlEncoder.Decode(String arg) in C:\agent2\_work\56\s\src\Microsoft.IdentityModel.Tokens\Base64UrlEncoder.cs:line 150 at SitefinityWebApp.Mvc.Controllers.LogController.Index(String location, String type, String entityId, String element, String targetaction, String referrerUrl, String value) in C:\GitSourceCodes\mcbi_sf\src\Mvc\Controllers\LogController.cs:line 85