Expression Evaluation in rule - A User and group Picker component [label ='']has an invalid value for value. All users and groups must be valid and visible to the viewer

Hi,

I am getting above error while selecting user for task assignment on the interface.

a!pickerFieldUsersAndGroups(
value: rule!<rulename>(
fv!item.Assignee
),

Rule code

if(
rule!APN_isBlank(
ri!userOrGroup
),
null,
if(
charat(
tostring(
ri!userOrGroup
),
1
) = "[",
togroup(
ri!userOrGroup
),
touser(
ri!userOrGroup
)
)
)

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