problem when using proguard

[Mido-xyz]

i add this line to proguard rules

-keepattributes Signature
-keepclassmembers class * extends com.onegravity.rteditor.spans.RTSpan {
public (int);
}

and when i set "minifyEnabled true" the app crash

Caused by java.lang.ClassCastException: java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType
at com.onegravity.rteditor.effects.BooleanEffect.(BooleanEffect.java:34)
at com.onegravity.rteditor.effects.BoldEffect.(BoldEffect.java:24)
at com.onegravity.rteditor.effects.Effects.(Effects.java:37)
at androidx.appcompat.app.AlertController$ButtonHandler.handleMessage(AlertController.java:167)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:230)
at android.os.Looper.loop(Looper.java:319)
at android.app.ActivityThread.main(ActivityThread.java:8893)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:608)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1103)

can you help me please.