Android - Error building Player: CommandInvokationFailure: Unable to list target platforms. What causes this?

This is my error:

Error building Player: CommandInvokationFailure: Unable to list target platforms. Please make sure the android sdk path is correct. See the Console for more details.
C:/Program Files/Java/jdk1.8.0_121\bin\java.exe -Xmx2048M -Dcom.android.sdkmanager.toolsdir=“C:/Users/equipo/AppData/Local/Android/sdk ools” -Dfile.encoding=UTF8 -jar “C:\Program Files\Unity\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\sdktools.jar” -

stderr[
Error:Invalid command android
]
stdout[

]
exit code: 64

Thank you.

Seems like a duplicate, see my answer on this question: Unity android compilation error - Questions & Answers - Unity Discussions