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IncrementalExecutor::executeFunction: symbol '_Z4sqrtf' unresolved

hi,
im using root 6.13
gcc Apple clang version 11.0.3 (clang-1103.0.32.62)
Python 2.7.16

recently i updated my os to the latest catalina 10.15
i then came across this error :
IncrementalExecutor::executeFunction: symbol ‘_Z4sqrtf’ unresolved while linking [cling interface function]!
You are probably missing the definition of sqrt(float)
Maybe you need to load the corresponding shared library?

is there any suggestion on how i may resolve this issue
thanks

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