When updating data i didn't get multiple dropdown field and gettting error

When updating data i didn't get multiple dropdown field and gettting error like:

Interface Definition: Expression evaluation error at function a!multipleDropdownField [line 609]: A multiple dropdown component [label="Employee Name"] has an invalid value for "value". All selected values must be present in the choiceValues array, but value was adetuya, akshaymoghe and choiceValues was aalapv; aartibansal; abdul_khan1; achyutamm; adetuya; aghosh; aishwarya_bajpayee; akaul; akshaymoghe; akshay_nikam; ankit_bass; apawar; asimzr; atadeo; basava_raju_g; basitza; bhushans; bilalq; carolina_branas; chandramauliv; chiragk; chrisxl; cjansen; clarkm; dhavaljp; diana_palmer; dilippathare; dpaul; dterzian; elomboy; francisab; gbubattula; gpattnaik; haroona; harshadp; humzak; jalpa_dave; jlakkimsetty; jmishra; jpattan; kamalpreetarora; kanikanarang; karangauba; karishma_babbar; kjaladi; ksiginumsetti; lindsey_pecor; luke_kovar; mayanksengar; mehakbakshi; mkonanki; mohitarora; mszekely; muhammadza; nikhil_chhabra; nirajs; nivedita_singh; nupursood; pbhardwaj; prernasuri; priyankatr@vuram.com; psunder; rajeshm; ramyasahu; ritikak; rkarthik; rnadendla; rushitv; sandeepsachdeva; saransharya; saransh_arora; sbajoria; schanda; sdomakonda; shrutikhanna; sonakshimahajan; soumya_chakraborty; spandrangi; thomas_kelly; tushararora; vaibhavgupta; vaibhav_gupta2; yanand; yappikonda.

My Code is like below:

a!multipleDropdownField(
label: "Employee Name",
labelPosition: "ABOVE",
choiceLabels:touniformstring(
index(
local!modeleroptions,
"name",
{}
)
),
choiceValues: touniformstring(
index(
local!modeleroptions,
"id",
{}
)
),
value:
joinarray(
a!forEach(
items: local!employee,
expression:
fv!item

),
", "
)

,
saveInto: {a!save(local!employee,save!value),a!save(ri!NondevProjectDetails.employeename,local!employee)},
searchDisplay: "AUTO",
validations: {}
)
}

and local!employee value is [adetuya; akshaymoghe]

when there is only one employee i got data when updating but for more than 1 employee i got this error