Error while deleting multiple user from grid

Question

a!localVariables(
 local!selectionValue,
 local!isUserSelected: runtimetypeof(local!selectionValue) = 'type!{http://www.appian.com/ae/types/2009}User',
 local!actionTaken: if(
 isnull(ri!btnAction),
 false,
 or(ri!btnAction = "ADD")
 ), 
 local!navigationLength: if(
 isnull(ri!navigationPath),
 0,
 length(ri!navigationPath)
 ),
 a!formLayout(
 label: "User Management",
 contents: {
 a!pickerFieldGroups(
 label: "Select a group to view its members",
 maxSelections: 1,
 value: ri!initialGroup,
 saveInto: {
 ri!initialGroup,
 a!save(
 {
 ri!btnAction,
 ri!addedToGroup,
 ri!removeFromGroup,
 ri!navigationPath,
 local!selectionValue
 },
 null
 )
 }
 ),
 a!sectionLayout(
 label: group(ri!initialGroup, "groupName") & " Members",
 contents: {
 a!buttonLayout(
 a!buttonWidget(
 label: "Remove Member",
 value: a!removeGroupMembers(
 members:ri!removeFromGroup
 ),
 saveInto: {
 ri!btnAction,
 a!save(ri!userToRemove, local!selectionValue),
 /*
 Since a user needs to be removed from a group, the button
 needs to determine what group the user should be removed from.
 */
 a!save(
 ri!removeFromGroup,
 if(
 /* If the user is on the first column, save the initial group */
 local!navigationLength = 1,
 ri!initialGroup,
 /* Otherwise save the group containing the selected user */ 
 ri!navigationPath[local!navigationLength - 1]
 )
 ),
 /*
 This navigation path will be used to pre-populate the group browser
 when the user returns to this interface after the selected user has
 been removed. Therefore, we must remove the selected user from the
 navigation path to prevent an error.
 */
 a!save(ri!navigationPath, rdrop(ri!navigationPath, 1))
 },
 submit: true,
 color: "NEGATIVE",
 disabled: or(ri!btnAction,(local!selectionValue)),
 )
 ),
 a!sectionLayout( 
 label: "",
 contents: {
 a!gridField(
 labelPosition: "COLLAPSED",
 data: a!groupMembers(
 group: ri!initialGroup
 ),
 columns: {
 a!gridColumn(
 label: "Group Members",
 value: fv!row,
 sortField: "displayName"
 )
 },
 pagingSaveInto: null,
 borderStyle: "STANDARD",
 selectable: true,
 selectionStyle: "CHECKBOX",
 selectionValue: local!selectionValue,
 selectionSaveInto: local!selectionValue
 )
 }
 ),
 a!linkField(
 labelPosition: "COLLAPSED",
 links: {
 a!dynamicLink(
 label: "+ Add Users to " & group(ri!initialGroup, "groupName"),
 value: "ADD",
 saveInto: {
 ri!btnAction,
 a!save(ri!addedToGroup, ri!initialGroup)
 }
 )
 },
 showWhen: not( local!actionTaken)
 )
 },
 showWhen: not(isnull(ri!initialGroup))
 ),
 a!sectionLayout(
 label: "Add Users to " & group(ri!addedToGroup, "groupName"),
 contents: {
 a!pickerFieldUsers(
 label: "Users to Add",
 value: ri!usersToAdd,
 saveInto: a!save(ri!usersToAdd, getdistinctusers(save!value)),
 required: true
 )
 },
 showWhen: ri!btnAction = "ADD"
 ),
 a!buttonLayout(
 primaryButtons: {
 a!buttonWidget(
 label: if(ri!btnAction = "ADD", "Add Users", ""),
 submit: true,
 style: "SOLID"
 )
 },
 secondaryButtons: {
 /*
 Allows the user to cancel the selected action. If the user
 cancels out of the action, we need to clear all the
 selection variables
 */
 a!buttonWidget(
 label: "Cancel",
 value: null,
 saveInto: {
 ri!btnAction,
 ri!userToRemove,
 ri!addedToGroup,
 ri!removeFromGroup,
 ri!usersToAdd,
 local!selectionValue
 },
 style: "OUTLINE",
 showWhen: local!actionTaken
 )
 },
 showWhen: local!actionTaken
 )
 },
 buttons: a!buttonLayout(
 primaryButtons: {
 a!buttonWidget(
 label: "Close",
 value: "CLOSE",
 saveInto: ri!btnAction,
 submit: true,
 validate: false
 )
 }
 )
 )
)

Mike Schmitt · Answer

It feels like you're using some of these components without fully understanding what they actually do. I understand it's part of the learning process, though generally I'd recommend starting simpler and building up from there, making sure you understand what the code is doing before stepping up to the next level of complexity. 
 In the case of your "remove users" button though, per what Stefan mentioned, you have a simple mix-up. For an action button like this, the "value" parameter is arbitrary and often not needed at all (like in your case). The "remove group members" function, as is mentioned in the documentation, needs to go * directly in the SaveInto *. 
 a!buttonWidget(
 label: "Remove Member",
 /* value: a!removeGroupMembers(
 members:ri!removeFromGroup
 ), */
 saveInto: {
 /* ri!btnAction, */ /*probably not needed */
 /* a!save(ri!userToRemove, local!selectionValue), */ /* also probably not needed */
 a!removeGroupMembers(
 group: ri!initialGroup,
 members: local!selectionValue
 )
 }
 )

Error while deleting multiple user from grid

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