'PDSI Package: Not compatible with requested type: [type=character; target=double]

I m using the package scPDSI. My data set is this

head(pdsi_data)
   yr     PE      P
1 1981 145.85   44.7
2 1981 143.42  45.64
3 1981 114.76 309.16
4 1981 135.19   58.2
5 1981 126.61  35.57
6 1981 124.12  18.94

When I applied the function pdsi this error appears

pdsi(pdsi_data$P, pdsi_data$PE, start=1981, sc=FALSE)

Fehler in C_pdsi(P, PE, AWC, start, end, cal_start, cal_end, sc, getOption("PDSI.coe.K1.1"),  : 
  Not compatible with requested type: [type=character; target=double].

I would appreciate some help on this matter. Thanks!

r types character

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'PDSI Package: Not compatible with requested type: [type=character; target=double]

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