It is likely the "p" variable is not defined in your R environment.
Inside your function model.LIDR, the variable "p" is used before being
initialized
in any of the environments reachable by the search path, included the model.LIDR
function environment.
The remedy is to define and initialize "p" before it is being referenced (used).
It is not about any deSolve package specific error.
--
GG
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