WebGL unable to build or run

I've been trying the last few hours to figure out why my game isn't able to build or run using WebGL. It worked fine when I changed the platform to PC. These are the errors I've been getting anytime i try to build and run. Any help is much appreciated.

MissingMethodException: Method not found: 'UnityEditorInternal.BaseIl2CppPlatformProvider..ctor'.
UnityEditor.WebGL.WebGlBuildPostprocessor.CompileBuild (BuildPostProcessArgs args) (at /Users/builduser/buildslave/unity/build/PlatformDependent/WebGL/Extensions/Unity.WebGL.extensions/BuildPostprocessor.cs:363)
UnityEditor.WebGL.WebGlBuildPostprocessor.PostProcess (BuildPostProcessArgs args) (at /Users/builduser/buildslave/unity/build/PlatformDependent/WebGL/Extensions/Unity.WebGL.extensions/BuildPostprocessor.cs:936)
UnityEditor.Modules.DefaultBuildPostprocessor.PostProcess (BuildPostProcessArgs args, UnityEditor.BuildProperties& outProperties) (at C:/buildslave/unity/build/Editor/Mono/Modules/DefaultBuildPostprocessor.cs:27)
UnityEditor.PostprocessBuildPlayer.Postprocess (BuildTargetGroup targetGroup, BuildTarget target, System.String installPath, System.String companyName, System.String productName, Int32 width, Int32 height, BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.Build.Reporting.BuildReport report) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/PostprocessBuildPlayer.cs:287)
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)

Error building Player: 2 errors

Build completed with a result of 'Failed'
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)

UnityEditor.BuildPlayerWindow+BuildMethodException: 3 errors
at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (BuildPlayerOptions options) [0x0021f] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:187
at UnityEditor.BuildPlayerWindow.CallBuildMethods (Boolean askForBuildLocation, BuildOptions defaultBuildOptions) [0x0007f] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:94
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)

 

Which version of Unity are you attempting to build from? What player settings options have you tried? etc.? It's unlikely to receive meaningful help unless you provide the specifics people need in order to help find a problem.