Error in R_nc4_open: No such file or directory

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library(terra)
library('sp')
library(raster)
library('gimms','rgdal')
input <- "F:/BaiduSyncdisk/graduatepaper/guaduate/data"
out <- "F:/BaiduSyncdisk/graduatepaper/guaduate/area/gimms_NDVI"
fn1 <- paste0(input,"/ndvi3g_geo_v1_",2020,"_","0712",".nc4")
ndvi3g <- rasterizeGimms(x = fn1)  

Error in R_nc4_open: No such file or directory
Error in ncdf4::nc_open(filename, suppress_dimvals = TRUE) :
Error in nc_open trying to open file F:/BaiduSyncdisk/graduatepaper/guaduate/data/ndvi3g_geo_v1_2020_0712.nc4 (return_on_error= FALSE )

I tried to change the working path, but it didn'twork.

getwd()
# [1] "D:/Program Files/R"
setwd("F:/BaiduSyncdisk/graduatepaper/guaduate/data")
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