# Error: Can't resolve all parameters for MyPage:

**URL:** <https://forum.ionicframework.com/t/error-cant-resolve-all-parameters-for-mypage/107620>\
**Category:** ionic-v3\
**Created:** [October 4, 2017, 10:56am UTC](https://forum.ionicframework.com/t/error-cant-resolve-all-parameters-for-mypage/107620 "2017-10-04T10:56:19Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![anton\_klochko](https://avatars.discourse-cdn.com/v4/letter/a/d78d45/32.png) [@anton\_klochko](https://forum.ionicframework.com/u/anton_klochko)\
**Post date:** [October 4, 2017, 10:56am UTC](https://forum.ionicframework.com/t/error-cant-resolve-all-parameters-for-mypage/107620/1 "2017-10-04T10:56:20Z")

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Hi all ! Could anyone suggest please how to fix such error, after successful build on Ios platform I see white screen with such error …

```auto
Error: Can't resolve all parameters for MyPage: ([object Object], [object Object], [object Object], [object Object], [object Object], [object Object], ?, [object Object]).

```

```auto
cli packages: (/usr/local/lib/node_modules)

    @ionic/cli-utils : 1.12.0
    ionic (Ionic CLI) : 3.12.0

global packages:

    cordova (Cordova CLI) : 7.0.1 

local packages:

    @ionic/app-scripts : 3.0.0
    Cordova Platforms : ios 4.5.1
    Ionic Framework : ionic-angular 3.7.1

System:

    Node : v6.11.3
    npm : 3.10.10 
    OS : macOS Sierra
    Xcode : Xcode 9.0 Build version 9A235 

Misc:

    backend : pro

```

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<div class="post-metadata">

**Author:** ![wthijmen](https://sea1.discourse-cdn.com/ionicframework/user_avatar/forum.ionicframework.com/wthijmen/32/113686_2.png) [@wthijmen](https://forum.ionicframework.com/u/wthijmen)\
**Post date:** [October 4, 2017, 10:57am UTC](https://forum.ionicframework.com/t/error-cant-resolve-all-parameters-for-mypage/107620/2 "2017-10-04T10:57:32Z")

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The `?` in your constructor is not defined on this page.

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<div class="post-metadata">

**Author:** ![anton\_klochko](https://avatars.discourse-cdn.com/v4/letter/a/d78d45/32.png) [@anton\_klochko](https://forum.ionicframework.com/u/anton_klochko)\
**Post date:** [October 4, 2017, 11:02am UTC](https://forum.ionicframework.com/t/error-cant-resolve-all-parameters-for-mypage/107620/3 "2017-10-04T11:02:34Z")

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**wthijmen** , good day ! I do not see any errors in my IDE …

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<div class="post-metadata">

**Author:** ![anton\_klochko](https://avatars.discourse-cdn.com/v4/letter/a/d78d45/32.png) [@anton\_klochko](https://forum.ionicframework.com/u/anton_klochko)\
**Post date:** [October 4, 2017, 11:32am UTC](https://forum.ionicframework.com/t/error-cant-resolve-all-parameters-for-mypage/107620/4 "2017-10-04T11:32:38Z")

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How to uderstand where I have a mistake ?

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<div class="post-metadata">

**Author:** ![rapropos](https://sea1.discourse-cdn.com/ionicframework/user_avatar/forum.ionicframework.com/rapropos/32/100227_2.png) [@rapropos](https://forum.ionicframework.com/u/rapropos)\
**Post date:** [October 4, 2017, 8:26pm UTC](https://forum.ionicframework.com/t/error-cant-resolve-all-parameters-for-mypage/107620/5 "2017-10-04T20:26:51Z")

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By counting constructor parameters until you hit the one where the `?` is.

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<div class="post-metadata">

**Author:** ![anton\_klochko](https://avatars.discourse-cdn.com/v4/letter/a/d78d45/32.png) [@anton\_klochko](https://forum.ionicframework.com/u/anton_klochko)\
**Post date:** [October 5, 2017, 7:43am UTC](https://forum.ionicframework.com/t/error-cant-resolve-all-parameters-for-mypage/107620/6 "2017-10-05T07:43:42Z")

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**rapropos** , I found mistake … in constructor run provider which run page with same provider …

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<div class="post-metadata">

**Author:** ![maxizapata](https://avatars.discourse-cdn.com/v4/letter/m/ecae2f/32.png) [@maxizapata](https://forum.ionicframework.com/u/maxizapata)\
**Post date:** [October 6, 2018, 7:18pm UTC](https://forum.ionicframework.com/t/error-cant-resolve-all-parameters-for-mypage/107620/7 "2018-10-06T19:18:10Z")

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Hi @anton_klochko can you show me the code of provider with the solution?

Thanks!