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Error: Type <customtype> cannot be resolved

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EnvironmentProduct: Sitefinity
Versions: 5.x, 6.x, 7.x, 8.x, 9.x
OS: All supported OS versions
Database: All supported Microsoft SQL Server versions
Question/Problem Description
The exception "Type <custom type> cannot be resolved" is thrown. Apparently Sitefinity cannot find a custom control in the project.
Steps to Reproduce
Clarifying Information
Error MessageType : System.ArgumentException, mscorlib, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089
Message : Type "CustomUrl.CustomBlogProvider, SitefinityWebApp" cannot be resolved.
Source : Telerik.Sitefinity.Utilities
Help link :
ParamName :
Data : System.Collections.ListDictionaryInternal
TargetSite : System.Type GetType(System.String, Boolean, Boolean)
HResult : -2147024809
Stack Trace : at Telerik.Sitefinity.Utilities.TypeConverters.TypeResolutionService.GetType(String name, Boolean throwOnError, Boolean ignoreCase)
at Telerik.Sitefinity.Utilities.TypeConverters.TypeResolutionService.GetType(String name)
at Telerik.Sitefinity.Configuration.DataProviderSettings.get_ProviderType()
at Telerik.Sitefinity.Data.ManagerBase`1.InstantiateProvider(IDataProviderSettings providerSettings, Type providerType, ExceptionPolicyName policy, Type managerType)

Additional Info:

TimeStamp : 2/15/2017 5:34:30 PM
FullName : Telerik.Sitefinity.Utilities, Version=9.2.6226.0, Culture=neutral, PublicKeyToken=b28c218413bdf563
AppDomainName : /LM/W3SVC/179/ROOT-3-131316536557298251
ThreadIdentity :
Requested URL :
Defect/Enhancement Number
It is possible that the custom control is not included in the solution.
Double check whether the control is included in the solution and if is not, then include it by right clicking on the file and selecting "Include in project"

Include in the Project


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