Ionic Charts Problem

hi guys,
i try to create circle charts with ionic but when i load page console say:

ERROR Error: Uncaught (in promise): Error: "doughnut" is not a registered controller.
Error: "doughnut" is not a registered controller.
    at Registry._get (chart.esm.js:4918)
    at Registry.getController (chart.esm.js:4863)
    at Chart.buildOrUpdateControllers (chart.esm.js:5584)
    at Chart.update (chart.esm.js:5628)
    at new Chart (chart.esm.js:5395)
    at DashBoardPage.doughnutChartMethod (dash-board.page.ts:69)
    at DashBoardPage.ngAfterViewInit (dash-board.page.ts:34)
    at callHook (core.js:2526)
    at callHooks (core.js:2495)
    at executeInitAndCheckHooks (core.js:2446)
    at resolvePromise (zone.js:1255)
    at resolvePromise (zone.js:1209)
    at zone.js:1321
    at ZoneDelegate.invokeTask (zone.js:434)
    at Object.onInvokeTask (core.js:28692)
    at ZoneDelegate.invokeTask (zone.js:433)
    at Zone.runTask (zone.js:205)
    at drainMicroTaskQueue (zone.js:620)
    at ZoneTask.invokeTask [as invoke] (zone.js:520)
    at invokeTask (zone.js:1656)
defaultErrorLogger @ core.js:6479
zone.js:209 Uncaught Error: "doughnut" is not a registered controller.
    at Registry._get (chart.esm.js:4918)
    at Registry.getController (chart.esm.js:4863)
    at Chart.buildOrUpdateControllers (chart.esm.js:5584)
    at Chart.update (chart.esm.js:5628)
    at chart.esm.js:5385
    at Chart._doResize (helpers.segment.js:40)
    at Chart._resize (chart.esm.js:5463)
    at Chart.resize (chart.esm.js:5442)
    at listener (chart.esm.js:5940)
    at chart.esm.js:3179

Hi @giocosc90 ,

Welcome to FCC!

I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.

See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (’).

thanks but i need help with the project

Hi @giocosc90

When asking a question, it always helps to provide a description of what you are trying to do. I have not had any experience with ionic but there are some folks here who might be able to help if you provide enough details.