@VallabhiAgr 

your script include should be client callable then only it can be called from report filter condition

If you have created the Script Include in ServiceNow version "Washington" and above make sure, you have checked the "Sandbox enabled" Checkbox.

var BlankRequestChecker = Class.create();
BlankRequestChecker.prototype = Object.extendsObject(AbstractAjaxProcessor, {

    getBlankRequestList: function() {
        var blankRequestSysIDs = [];
        var req = new GlideRecord('sc_request');
        req.addQuery('active', true);
        req.query();
        while (req.next()) {

            var ritm = new GlideRecord('sc_req_item');
            ritm.addQuery('request', req.sys_id);
            ritm.query();
            if (ritm.hasNext()) continue;

            var approval = new GlideRecord('sysapproval_approver');
            approval.addQuery('sysapproval', req.sys_id);
            approval.addQuery('state', 'requested');
            approval.query();
            if (approval.hasNext()) continue;

            var task = new GlideRecord('sc_task');
            task.addQuery('request', req.sys_id);
            task.addQuery('active', true);
            task.query();
            if (task.hasNext()) continue;

            blankRequestSysIDs.push(req.sys_id.toString());
        }
        return blankRequestSysIDs;
    },

    type: 'BlankRequestChecker'
});

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its already client callable still getting the error

@VallabhiAgr 

client callable script include should not have initialize() method

Please remove that and copy my script

Also ensure about this point

If you have created the Script Include in ServiceNow version "Washington" and above make sure, you have checked the "Sandbox enabled" Checkbox.

💡 If my response helped, please mark it as correct ✅ and close the thread 🔒— this helps future readers find the solution faster! 🙏

I have used your script still getting the same error and I am using Yokhlama version there is not option for sandbox.