[datatable-help] Matrix multiplication in R: requires numeric/complex matrix/vector arguments

[Kokia Z]

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Error in Ws %*% as.matrix(endog) :
requires numeric/complex matrix/vector arguments
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where ‘Ws’ is a N*N spatial weight matrix and ‘endog’is N*3 (we have three endogenous variables)
I cannot understand why this error occours because when I set only one endogenous variable my code works well.
What's more, three endogenous variables are not dummy.
Is it because that two of these endogenous variables are interaction? Or because of the package 'splm/spgm' cannot allow for extra endogenous variables?

Here is part of my code:
c11_omega <- interaction(mydata$c11,mydata$omega)
d11_omega <- interaction(mydata$d11,mydata$omega)
endog = ~ omega + c11_omega + d11_omega
instruments = ~ XI + c11_XI + d11_XI


and the regression is:
fm <- ex ~ c11 + d11 + control variables




Thanks for your help!
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