Error building Player: FormatException: Input string was not in the correct format in Unity 2018

I just updated to Unity 2018.2.02b3 and when trying to build the apk I can't. This is the log but I can't understand it so I would appreciate if anyone could help me. I think it says something about using Parse with a string that it is not numbers but I haven't use Parse in this project so I-m quite lost. Thanks!

Console Log:
FormatException: Input string was not in the correct format
System.Int32.Parse (System.String s) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/Int32.cs:629)
System.Version..ctor (System.String version) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/Version.cs:109)
UnityEditor.Android.Utils.ParseVersion (System.String version)
UnityEditor.Android.AndroidComponentProperties.get_PackageRevision ()
UnityEditor.Android.AndroidComponentProperties.GetPackageRevision (System.String directory)
UnityEditor.Android.AndroidSDKTools.BuildToolsVersion ()
UnityEditor.Android.PostProcessor.Tasks.CheckAndroidSDK+SDKBuildToolsDetector.GetVersion (UnityEditor.Android.AndroidSDKTools sdkTools, UnityEditor.Android.AndroidJavaTools javaTools)
UnityEditor.Android.PostProcessor.Tasks.CheckAndroidSDK+SDKComponentDetector.Detect (UnityEditor.Android.AndroidSDKTools sdkTools, UnityEditor.Android.AndroidJavaTools javaTools, System.Version minVersion, UnityEditor.Android.PostProcessor.ProgressHandler onProgress)
UnityEditor.Android.PostProcessor.Tasks.CheckAndroidSDK.EnsureSDKComponentVersion (UnityEditor.Android.AndroidJavaTools javaTools, System.Version minVersion, UnityEditor.Android.PostProcessor.Tasks.SDKComponentDetector detector)
UnityEditor.Android.PostProcessor.Tasks.CheckAndroidSDK.EnsureSDKComponentVersion (UnityEditor.Android.AndroidJavaTools javaTools, Int32 minVersion, UnityEditor.Android.PostProcessor.Tasks.SDKComponentDetector detector)
UnityEditor.Android.PostProcessor.Tasks.CheckAndroidSDK.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context)
UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context)
UnityEditor.Android.PostProcessAndroidPlayer.PrepareForBuild (BuildOptions options, BuildTarget target)
UnityEditor.Android.AndroidBuildPostprocessor.PrepareForBuild (BuildOptions options, BuildTarget target)
UnityEditor.PostprocessBuildPlayer.PrepareForBuild (BuildOptions options, BuildTargetGroup targetGroup, BuildTarget target) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/PostprocessBuildPlayer.cs:106)
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)

 

The problem seems to be solved. What I did was going to android studio then file -> setting -> SDK Tools : uninstall version 28.0.0rcl and return to unity. Now Unity asked to install the newest SDK so I did and the build worked perfectly. Hope this can help

 

Yes, let unity to update build-tools to 26.
Build-tools at 28rc will throw this exception;