真机调试错误，这是什么情况？怎么定位问题？

VM21:2 (in promise) MiniProgramError

Cannot read property 'createView' of undefined

TypeError: Cannot read property 'createView' of undefined

    at n.value (eval at n.call.document (http://127.0.0.1:51844/remote-debug/runtime.js?devtools_ignore=true:1:11339), <anonymous>:2:1064980)

    at n.value (eval at n.call.document (http://127.0.0.1:51844/remote-debug/runtime.js?devtools_ignore=true:1:11339), <anonymous>:2:757375)

    at t (eval at n.call.document (http://127.0.0.1:51844/remote-debug/runtime.js?devtools_ignore=true:1:11339), <anonymous>:2:757542)

    at n.value (eval at n.call.document (http://127.0.0.1:51844/remote-debug/runtime.js?devtools_ignore=true:1:11339), <anonymous>:2:757631)

    at eval (eval at n.call.document (http://127.0.0.1:51844/remote-debug/runtime.js?devtools_ignore=true:1:11339), <anonymous>:2:1300784)

    at new Promise (<anonymous>)

    at pu (eval at n.call.document (http://127.0.0.1:51844/remote-debug/runtime.js?devtools_ignore=true:1:11339), <anonymous>:2:1300746)

    at eval (eval at n.call.document (http://127.0.0.1:51844/remote-debug/runtime.js?devtools_ignore=true:1:11339), <anonymous>:2:1302216)

    at Array.forEach (<anonymous>)

    at r (eval at n.call.document (http://127.0.0.1:51844/remote-debug/runtime.js?devtools_ignore=true:1:11339), <anonymous>:2:1302194)