iOS: no member named 'get_marshal_info' in Bulk_mscorlib_9.cpp

[arfa123]

I am trying to compile my project on ios with these:
XCode: 11.3
React-Native: 0.61.5
Unity: 2018.4.15 with vuforia sdk
Device: iPhone 8 (13.2) simulator

followed the step as described there: https://github.com/rexraphael/react-native-unity-view#react-native-unity-view

but after resolving errors now I am stuck on these errors and not found any solution.
these errors are happening in this file: 'UnityExport/Classes/Native/Bulk_mscorlib_9.cpp'

[arfa123]

the error has gone by appending '-DNET_4_0' to 'OTHER_CFLAGS' in UnityCofig.xcconfig file.