fwildclusterboot and fix effects

Hi,I am trying to implement the fwildclusterboot package on my fixest object.
Below is some sample code. I am clustering by c and also using it as a fixed effect in my model. Note that b is also a categorical variable.
model <- feols(Y ~ X |b + c, cluster = "c")
I run boottest as follows:
boottest(model, clustid = "c", param = "X", B = 9999)
The error I receive is: "error in solve.default(crossprod(weights_sq * X)) : system is computationally singular: reciprocal condition number"

Any advices at all will be much appreciated. Thank you very much.

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