I created .pbit file and while opening it does not prompt for the parameter.

Hi ArvindBhatt,

Thank you for reaching out in Microsoft Community Forum.

Thank you BeaBF  for the helpful response.

Please follow below steps to resolve the error;

1, Please Use optional Instead of nullable
shared Docusign = (optional AccountId as text, optional CustomQuery as text) =>
let
EffectiveQuery = if CustomQuery <> null then CustomQuery else "",
EffectiveAccountId = if AccountId <> null and AccountId <> "" then AccountId else error "AccountId is required!",

// Construct the main table
objects = #table(
{"Name", "Key", "Data", "ItemKind", "ItemName", "IsLeaf"},
{
{"CustomFields", "CustomFields", DocuConnector.CallAnalyticsAPI(EffectiveAccountId, "customfields_reporting_0001", "ReportingCustomFieldsMv", EffectiveQuery), "Table", "Table", true},
{"Agreements", "Agreements", Table.RenameColumns(DocuConnector.CallAnalyticsAPI(EffectiveAccountId, "urepo_reporting_0003", "ReportingAgreementMv", EffectiveQuery), {{"Id", "AgreementId"}}), "Table", "Table", true}
}
),

// Explicitly map the folder structure
NavTable = Table.ToNavigationTable(objects, {"Key"}, "Name", "Data", "ItemKind", "ItemName", "IsLeaf")
in
NavTable

2. Please Manually Reset Parameters in Power BI
Open the .pbit file → Transform Data → Edit Parameters → Enter AccountId → Apply.

3. Remove any existing AccountId value in Power Query before saving as .pbit.

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Regards,
Pavan.