Getting an error when creating a create a Completely Randomized Design (CRD) layout in R

I am trying to create a Completely Randomized Design (CRD) layout in R using the agricolae package. The design involves 8 treatments, each replicated 6 times. However, I encountered an error while executing the code.

Here is my code:

# Install and load the agricolae package
install.packages("agricolae")
library(agricolae)

# Define treatments and replicates
treatments <- c("A", "B", "C", "D", "E", "F", "G", "H")
replicates <- 1:6

# Create the CRD layout
layout <- design.crd(treatments, replicates)

# Print the layout
print(layout)

# Plot the layout
plot(layout)

The error I received is: Error in data. Frame(trt, r) : arguments imply differing number of rows: 8, 6. It seems that the number of rows for treatments and replicates is not matching.

As a workaround, I was able to create the layout using the expand.grid() function, like this:

# Define treatments and replicates
treatments <- c("A", "B", "C", "D", "E", "F", "G", "H")
replicates <- 1:6

# Generate the design matrix
design <- expand.grid(Treatment = treatments, Replicate = replicates)

However, I'm unsure how to plot the expand.grid object to produce a plot like the following (it's just an example)

Could someone please help me resolve the issue with agricolae package OR guide me on how to plot the layout using the expand.grid object?

The replicate term in design.crd() is not the name of the replicate by the number of desired replicates.
In this case, I am assuming you are looking for 6 replicates per treatment therefore the correct form of the function is:

design.crd(treatments, r=6)

If you would like to vary the number of replicates for each treatment then you need a vector equal to length of treatments.

design.crd(treatments, r=c(2, 2, 2, 3, 3, 4, 4, 6))