Error when running Kendall Package

I am new to R and am trying to run data through using the Kendall package. 
My first question is that I have NA values for certain criterias, will that
be a problem or will they be ignored?

ie:            Fall    Spring  Summer
      1988   NA      1.321   1.564
      1999   1.333  1.452    NA

When I try to run the test, I get this error:  "error: input must be ts
object"
Thanks,

Kou

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