Unable to retrieve results from old runs after opening Rdata from One Drive

Interfaces RStan
1

As a backup, I copied the local files of a project to One Drive, including the Rdata file containing all objects from previous Stan optimizations. When trying to access the output of one of these objects (e.g., $summary(), $lp()) ~on a different computer~, I wasn’t able. I keep receiving the following error:

Error in maybe_convert_draws_format(private$draws_, format) : 
  could not find function "maybe_convert_draws_format"

Sounds like a problem with the libraries. However, when executing a new optimization, I was able to obtain those results, no problem. In addition, I’m able to access the $time() function of all old runs.

I’m able to View the elements in the old runs environments. The first difference I noticed between old (unable to retrieve results) and new (able to retrieve results) runs is in the [[“hessian”]] and [[“grad_log_prob”]] functions.
This is how it looks when I’m able to get results:

function (unconstrained_variables, jacobian = TRUE, jacobian_adjustment = NULL) 
{
  if (!is.null(jacobian_adjustment)) {
    warning("'jacobian_adjustment' is deprecated. Please use 'jacobian' instead.", 
      call. = FALSE)
    jacobian <- jacobian_adjustment
  }
  if (is.null(private$model_methods_env_$model_ptr)) {
    stop("The method has not been compiled, please call `init_model_methods()` first", 
      call. = FALSE)
  }
  if (length(unconstrained_variables) != private$model_methods_env_$num_upars_) {
    stop("Model has ", private$model_methods_env_$num_upars_, 
      " unconstrained parameter(s), but ", length(unconstrained_variables), 
      " were provided!", call. = FALSE)
  }
  private$model_methods_env_$hessian(private$model_methods_env_$model_ptr_, 
    unconstrained_variables, jacobian)
}

And this is how it looks when I’m not:

function (unconstrained_variables, jacobian_adjustment = TRUE) 
{
  if (is.null(private$model_methods_env_$model_ptr)) {
    stop("The method has not been compiled, please call `init_model_methods()` first", 
      call. = FALSE)
  }
  if (length(unconstrained_variables) != private$model_methods_env_$num_upars_) {
    stop("Model has ", private$model_methods_env_$num_upars_, 
      " unconstrained parameter(s), but ", length(unconstrained_variables), 
      " were provided!", call. = FALSE)
  }
  private$model_methods_env_$hessian(private$model_methods_env_$model_ptr_, 
    unconstrained_variables, jacobian_adjustment)
}

I’m not sure if this is the crux of the issue. But I know any changes in the objects and their elements occurred when trying to open the new results from One Drive on a different computer.

Any insights will be much appreciated. To complicate things further, I no longer have the original Rdata file, but only the backup I copied in OneDrive.