"EntityComponentSystemSamples" Building on iOS causes an error

“EntityComponentSystemSamples”
Building this project on iOS(XCode10.1/Unity2019.1b4) will result in an error.
Does ECS still support iOS builds?
When do you correspond?

Error is

Undefined symbols for architecture arm64:
“_StaticBurstStaticMethodLookup”, referenced from:
_BurstStaticMethodLookup in lib_burst_generated.o
“_Staticburst_initialize”, referenced from:
_burst_initialize in lib_burst_generated.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

I met the same wrong,do you solve the problem?