imputation - TypeError when using MICE algorithm from Fancy Impute in Python -

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i'm trying fill missing data in dataset , mentor recommended used fancy impute package in python, , mice algorithm. first of all, read mice, it's clear it's poor option if missing data not random (which doubt since seems missing data more in specific countries/years). recommend different algorithm? (my project based on world bank gender statistics data).

the technical problem: ran code on dataframe:

filled = mice().complete(dfvars)

but got error, , mentor has no idea it's about, , haven't found other forums discussing mice in python @ all:

typeerror: ufunc 'isnan' not supported input types, , inputs not safely coerced supported types according casting rule ''safe''


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