XML Exeception when opening project

I recently updated to Unity 2018.2.6.f1 and I am getting this problem every time I open an existing project or even when I create a new project (full stack trace below): XmlException: expected ';' (3B) but found '/' (2F) Line 66, position 33.

I searched all over the internet, and it's most likely due to the fact that my file path has an '&' in it, since my username has an '&' in it. This boggles me because I used to use Unity just fine a few months back with the same username, and I never had this issue.

Although it does not prevent the game from running when I test it, I don't want this error to be problematic when I want to release a game. So how can I fix it?

 XmlException: expected ';' (3B) but found '/' (2F)  Line 66, position 33.
 Mono.Xml2.XmlTextReader.Expect (Int32 expected)
 Mono.Xml2.XmlTextReader.ReadEntityReference (Boolean ignoreEntityReferences)
 Mono.Xml2.XmlTextReader.ReadReference (Boolean ignoreEntityReferences)
 Mono.Xml2.XmlTextReader.ReadText (Boolean notWhitespace)
 Mono.Xml2.XmlTextReader.ReadContent ()
 Mono.Xml2.XmlTextReader.Read ()
 System.Xml.XmlTextReader.Read ()
 Mono.Xml.XmlFilterReader.Read ()
 System.Xml.Linq.XElement.LoadCore (System.Xml.XmlReader r, LoadOptions options)
 System.Xml.Linq.XNode.ReadFrom (System.Xml.XmlReader r, LoadOptions options)
 System.Xml.Linq.XContainer.ReadContentFrom (System.Xml.XmlReader reader, LoadOptions options)
 System.Xml.Linq.XElement.LoadCore (System.Xml.XmlReader r, LoadOptions options)
 System.Xml.Linq.XNode.ReadFrom (System.Xml.XmlReader r, LoadOptions options)
 System.Xml.Linq.XContainer.ReadContentFrom (System.Xml.XmlReader reader, LoadOptions options)
 System.Xml.Linq.XElement.LoadCore (System.Xml.XmlReader r, LoadOptions options)
 System.Xml.Linq.XNode.ReadFrom (System.Xml.XmlReader r, LoadOptions options)
 System.Xml.Linq.XContainer.ReadContentFrom (System.Xml.XmlReader reader, LoadOptions options)
 System.Xml.Linq.XElement.LoadCore (System.Xml.XmlReader r, LoadOptions options)
 System.Xml.Linq.XNode.ReadFrom (System.Xml.XmlReader r, LoadOptions options)
 System.Xml.Linq.XContainer.ReadContentFrom (System.Xml.XmlReader reader, LoadOptions options)
 System.Xml.Linq.XDocument.ReadContent (System.Xml.XmlReader reader, LoadOptions options)
 System.Xml.Linq.XDocument.LoadCore (System.Xml.XmlReader reader, LoadOptions options)
 System.Xml.Linq.XDocument.Load (System.IO.TextReader reader, LoadOptions options)
 System.Xml.Linq.XDocument.Parse (System.String s, LoadOptions options)
 System.Xml.Linq.XDocument.Parse (System.String s)
 SyntaxTree.VisualStudio.Unity.Bridge.ProjectFilePostprocessor.OnGeneratedCSProject (System.String path, System.String content)
 System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)
 Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
 System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:232)
 System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115)
 UnityEditor.AssetPostprocessingInternal.CallOnGeneratedCSProject (System.String path, System.String content) (at C:/buildslave/unity/build/Editor/Mono/AssetPostprocessor.cs:178)
 UnityEditor.VisualStudioIntegration.SolutionSynchronizer.SyncProjectFileIfNotChanged (System.String path, System.String newContents) (at C:/buildslave/unity/build/Editor/Mono/VisualStudioIntegration/SolutionSynchronizer.cs:315)
 UnityEditor.VisualStudioIntegration.SolutionSynchronizer.SyncProject (MonoIsland island, System.Collections.Generic.Dictionary`2 allAssetsProjectParts, UnityEditor.Scripting.Compilers.ResponseFileData responseFileData, System.Collections.Generic.List`1 allProjectIslands) (at C:/buildslave/unity/build/Editor/Mono/VisualStudioIntegration/SolutionSynchronizer.cs:308)
 UnityEditor.VisualStudioIntegration.SolutionSynchronizer.GenerateAndWriteSolutionAndProjects (ScriptEditor scriptEditor) (at C:/buildslave/unity/build/Editor/Mono/VisualStudioIntegration/SolutionSynchronizer.cs:240)
 UnityEditor.VisualStudioIntegration.SolutionSynchronizer.Sync () (at C:/buildslave/unity/build/Editor/Mono/VisualStudioIntegration/SolutionSynchronizer.cs:212)
 UnityEditor.SyncVS.SyncVisualStudioProjectIfItAlreadyExists () (at C:/buildslave/unity/build/Editor/Mono/SyncProject.cs:163)