Android Question Xlint:unchecked, compile error

B4A version: 6.50
Parsing code. (0.09s)
Compiling code. (0.19s)
Compiling layouts code. (0.00s)
Organizing libraries. (0.00s)
Generating R file. (0.25s)
Compiling generated Java code. Error
javac 1.8.0_60
src\mlc\filetransferad\serverservice.java:85: error: cannot find symbol
super.onTaskRemoved(rootIntent);
^
symbol: method onTaskRemoved(Intent)
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error

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