I know there are many posts about this topic and I already tried to fix it by adding, editing and deleting the system variables.
My variables are the following:
M2_Home: C:\Program Files\apache-maven-3.5.0 (I already tried it with \bin didn't work ether.)
JAVA_Home: C:\Users\haa\Desktop\jdk1.8.0_101
Path:%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;C:\Windows\CCM;C:\Program Files\Microsoft SQL Server\120\Tools\Binn\;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC\110\Tools\Binn\;C:\Program Files (x86)\Microsoft SQL Server\120\Tools\Binn\;C:\Program Files\Microsoft SQL Server\120\DTS\Binn\;C:\Program Files (x86)\Microsoft SQL Server\120\Tools\Binn\ManagementStudio\;C:\Program Files (x86)\Microsoft SQL Server\120\DTS\Binn\;C:\Users\haa\Desktop\ARA_STUFF\apache-maven-3.5.0\apache-maven\src\bin;C:\Program Files (x86)\WebEx\Productivity Tools;%systemroot%\System32\WindowsPowerShell\v1.0\;%systemroot%\System32\WindowsPowerShell\v1.0\;C:\Program Files\apache-maven-3.5.0\bin;%JAVA_HOME%
Does anyone know what I could try to fix this issue?