Android Question Error from tool sdk

Hi

entering sdk choose from b4a i have this issue:

Error: Warning: Observed package id 'build-tools;26.0.0-rc2' in inconsistent location 'D:\MatrixApk\Android-SDK\build-tools\26.0.0-preview' (Expected 'D:\MatrixApk\Android-SDK\build-tools\26.0.0-rc2')

Exception in thread "main" java.lang.NoSuchFieldError: FN_AAPT2

at com.android.sdklib.BuildToolInfo.<init>(BuildToolInfo.java:362)

at com.android.sdklib.BuildToolInfo.fromStandardDirectoryLayout(BuildToolInfo.java:233)

at com.android.sdklib.repository.legacy.local.LocalSdk.scanBuildTools(LocalSdk.java:897) .................

How can I resolve ?
Thanks